diff --git a/src/core/p5.Renderer3D.js b/src/core/p5.Renderer3D.js
index 455ec6d59c..5b1a365081 100644
--- a/src/core/p5.Renderer3D.js
+++ b/src/core/p5.Renderer3D.js
@@ -148,6 +148,10 @@ export class Renderer3D extends Renderer {
     this.states.drawMode = constants.FILL;
 
     this.states._tex = null;
+    this.states._specularTex = null;
+    this.states._ambientTex = null;
+    this.states._shininessTex = null;
+    this.states._normalTex = null;
     this.states.textureMode = constants.IMAGE;
     this.states.textureWrapX = constants.CLAMP;
     this.states.textureWrapY = constants.CLAMP;
@@ -611,7 +615,10 @@ export class Renderer3D extends Renderer {
             state.texture != null ||
             state.ambientColor != null ||
             state.specularColor != null ||
-            state.shininess != null);
+            state.shininess != null ||
+            state.specularTexture != null ||
+            state.ambientTexture != null ||
+            state.shininessTexture != null);
         if (hasMaterial) {
           this.push();
           this._applyPartState(state);
@@ -676,13 +683,29 @@ export class Renderer3D extends Renderer {
       this.states.setValue('curAmbientColor', partState.ambientColor);
       this.states.setValue('_hasSetAmbient', true);
     }
+    if (partState.ambientTexture) {
+      // an ambient map modulates the ambient term, so make sure it is on
+      this.states.setValue('_ambientTex', partState.ambientTexture);
+      this.states.setValue('_hasSetAmbient', true);
+    }
     if (partState.specularColor) {
       this.states.setValue('curSpecularColor', partState.specularColor);
       this.states.setValue('_useSpecularMaterial', true);
     }
+    if (partState.specularTexture) {
+      // a specular map modulates the specular term, so make sure that term is on
+      this.states.setValue('_specularTex', partState.specularTexture);
+      this.states.setValue('_useSpecularMaterial', true);
+    }
     if (partState.shininess != null) {
       this.states.setValue('_useShininess', partState.shininess);
     }
+    if (partState.shininessTexture) {
+      this.states.setValue('_shininessTex', partState.shininessTexture);
+    }
+    if (partState.normalTexture) {
+      this.states.setValue('_normalTex', partState.normalTexture);
+    }
   }
 
   _drawStrokes(geometry, { count } = {}) {
@@ -1454,14 +1477,27 @@ export class Renderer3D extends Renderer {
     else if (this.states._useNormalMaterial) {
       return this._getNormalShader();
     }
-    // Use light shader if lighting or textures are enabled
+    // Use light shader if lighting or textures are enabled. only reach for the
+    // heavier map variant when the current part actually binds an mtl map.
     else if (this.states.enableLighting || this.states._tex) {
-      return this._getLightShader();
+      return this._getLightShader(this._hasActiveTextureMap());
     }
     // Default to color shader if no other conditions are met
     return this._getColorShader();
   }
 
+  // true when the current material has any mtl texture map bound (specular,
+  // ambient, shininess or normal). drives both shader-variant selection and
+  // whether the map uniforms are worth binding at all.
+  _hasActiveTextureMap() {
+    return !!(
+      this.states._specularTex ||
+      this.states._ambientTex ||
+      this.states._shininessTex ||
+      this.states._normalTex
+    );
+  }
+
   baseMaterialShader() {
     return this._getLightShader();
   }
@@ -1567,6 +1603,28 @@ export class Renderer3D extends Renderer {
       fillShader.setUniform('uSampler', this.states._tex || empty);
     }
     this._settingFillUniforms = false;
+    // mtl texture maps only exist in the USE_TEXTURE_MAPS shader variant, which
+    // is only selected when a part actually binds one. so for the common case
+    // (lit scene, no maps) we skip all of these setUniform calls entirely and
+    // the plain phong shader carries none of the map uniforms. bind all four
+    // pairs together since the variant declares all of them.
+    if (this._hasActiveTextureMap()) {
+      // specular map (map_Ks)
+      fillShader.setUniform('uHasSpecularTex', !!this.states._specularTex);
+      fillShader.setUniform('uSpecularSampler', this.states._specularTex || empty);
+      // ambient map (map_Ka)
+      fillShader.setUniform('uHasAmbientTex', !!this.states._ambientTex);
+      fillShader.setUniform('uAmbientSampler', this.states._ambientTex || empty);
+      // shininess map (map_Ns): scales base shininess by the map's red channel
+      fillShader.setUniform('uHasShininessTex', !!this.states._shininessTex);
+      fillShader.setUniform(
+        'uShininessSampler',
+        this.states._shininessTex || empty
+      );
+      // normal map (map_Bump): perturbs the surface normal in tangent space
+      fillShader.setUniform('uHasNormalMap', !!this.states._normalTex);
+      fillShader.setUniform('uNormalSampler', this.states._normalTex || empty);
+    }
     fillShader.setUniform(
       'uTint',
       this.states.tint?._getRGBA([255, 255, 255, 255]) ?? [255, 255, 255, 255]
diff --git a/src/webgl/loading.js b/src/webgl/loading.js
index f9a546f03b..be0f4bee6f 100755
--- a/src/webgl/loading.js
+++ b/src/webgl/loading.js
@@ -74,6 +74,9 @@ function parseMtlData(data) {
     } else if (tokens[0] === 'map_Ks') {
       //specular texture
       materials[currentMaterial].specularTexturePath = tokens[1];
+    } else if (tokens[0] === 'map_Ns') {
+      //shininess texture
+      materials[currentMaterial].shininessTexturePath = tokens[1];
     } else if (tokens[0] === 'map_Bump' || tokens[0] === 'bump') {
       //bump map. -bm etc can precede the path so take the last token. parsed
       //but not used until the renderer handles it.
@@ -98,13 +101,39 @@ function mtlToPartState(material) {
   if (material.specularColor) state.specularColor = material.specularColor;
   if (material.shininess !== undefined) state.shininess = material.shininess;
   if (material.texture) state.texture = material.texture;
+  if (material.specularTexture) {
+    state.specularTexture = material.specularTexture;
+    // a specular map modulates a base specular colour; default to white so the
+    // map shows even when the mtl has a map_Ks but no explicit Ks colour.
+    if (!state.specularColor) state.specularColor = [1, 1, 1];
+  }
+  if (material.ambientTexture) {
+    state.ambientTexture = material.ambientTexture;
+    // same idea as the specular map: default the base ambient colour to white
+    if (!state.ambientColor) state.ambientColor = [1, 1, 1];
+  }
+  if (material.shininessTexture) {
+    state.shininessTexture = material.shininessTexture;
+    // the map scales the base shininess; default the base to 1 when no Ns
+    if (state.shininess == null) state.shininess = 1;
+  }
+  if (material.normalTexture) state.normalTexture = material.normalTexture;
   return state;
 }
 
-// load each material's diffuse texture (map_Kd) and hang it on the material so
-// it lands on the part state. paths resolve relative to the model file, a
-// texture that fails just gets skipped. no-op if there's no loadImage. only
-// map_Kd for now since that's all the renderer can use.
+// each texture map the renderer can use: the parsed path field on the material,
+// and the image field we hang the loaded p5.Image on for mtlToPartState to read.
+const MATERIAL_TEXTURE_MAPS = [
+  ['texturePath', 'texture'], // map_Kd (diffuse)
+  ['specularTexturePath', 'specularTexture'], // map_Ks (specular)
+  ['ambientTexturePath', 'ambientTexture'], // map_Ka (ambient)
+  ['shininessTexturePath', 'shininessTexture'], // map_Ns (shininess)
+  ['bumpTexturePath', 'normalTexture'] // map_Bump (normal)
+];
+
+// load each material's texture maps and hang them on the material so they land
+// on the part state. paths resolve relative to the model file, a texture that
+// fails just gets skipped. no-op if there's no loadImage.
 async function loadMaterialTextures(materials, modelPath, instance) {
   if (!instance || typeof instance.loadImage !== 'function') return;
 
@@ -115,18 +144,20 @@ async function loadMaterialTextures(materials, modelPath, instance) {
   const jobs = [];
   for (const name in materials) {
     const material = materials[name];
-    if (!material.texturePath) continue;
-    const url = resolve(material.texturePath);
-    jobs.push(
-      instance
-        .loadImage(url)
-        .then(img => {
-          material.texture = img;
-        })
-        .catch(() => {
-          console.warn(`Texture not found, skipping: ${url}`);
-        })
-    );
+    for (const [pathField, imageField] of MATERIAL_TEXTURE_MAPS) {
+      if (!material[pathField]) continue;
+      const url = resolve(material[pathField]);
+      jobs.push(
+        instance
+          .loadImage(url)
+          .then(img => {
+            material[imageField] = img;
+          })
+          .catch(() => {
+            console.warn(`Texture not found, skipping: ${url}`);
+          })
+      );
+    }
   }
 
   await Promise.all(jobs);
diff --git a/src/webgl/p5.GeometryPart.js b/src/webgl/p5.GeometryPart.js
index 7afa6e152a..3c3099a927 100644
--- a/src/webgl/p5.GeometryPart.js
+++ b/src/webgl/p5.GeometryPart.js
@@ -13,7 +13,11 @@ function createPartState() {
     ambientColor: null, // Ka -> [r, g, b] | null, each 0..1
     specularColor: null, // Ks -> [r, g, b] | null, each 0..1
     shininess: null, // Ns -> number | null
-    texture: null // map_Kd -> p5.Image | null
+    texture: null, // map_Kd -> p5.Image | null
+    specularTexture: null, // map_Ks -> p5.Image | null
+    ambientTexture: null, // map_Ka -> p5.Image | null
+    shininessTexture: null, // map_Ns -> p5.Image | null
+    normalTexture: null // map_Bump -> p5.Image | null
   };
 }
 
diff --git a/src/webgl/p5.RendererGL.js b/src/webgl/p5.RendererGL.js
index dbdbe3c201..cffb0f5f83 100644
--- a/src/webgl/p5.RendererGL.js
+++ b/src/webgl/p5.RendererGL.js
@@ -731,14 +731,22 @@ class RendererGL extends Renderer3D {
     return super.baseMaterialShader();
   }
 
-  _getLightShader() {
-    if (!this._defaultLightShader) {
+  // useTextureMaps compiles a second phong variant with the mtl texture-map
+  // code switched on via a #define. plain lit scenes keep getting the original
+  // shader with none of that compiled in, so they pay nothing for the feature.
+  _getLightShader(useTextureMaps = false) {
+    const cacheKey = useTextureMaps
+      ? '_defaultLightShaderWithMaps'
+      : '_defaultLightShader';
+    if (!this[cacheKey]) {
       if (this._pInst._glAttributes.perPixelLighting) {
-        this._defaultLightShader = new Shader(
+        const mapsDefine = useTextureMaps ? '#define USE_TEXTURE_MAPS\n' : '';
+        this[cacheKey] = new Shader(
           this,
           this._webGL2CompatibilityPrefix('vert', 'highp') +
             defaultShaders.phongVert,
           this._webGL2CompatibilityPrefix('frag', 'highp') +
+            mapsDefine +
             defaultShaders.phongFrag,
           {
             vertex: {
@@ -767,7 +775,9 @@ class RendererGL extends Renderer3D {
           }
         );
       } else {
-        this._defaultLightShader = new Shader(
+        // the non-per-pixel path uses lightTextureFrag, which has no map code,
+        // so both cache keys just resolve to the same plain shader here.
+        this[cacheKey] = new Shader(
           this,
           this._webGL2CompatibilityPrefix('vert', 'highp') +
             defaultShaders.lightVert,
@@ -777,7 +787,7 @@ class RendererGL extends Renderer3D {
       }
     }
 
-    return this._defaultLightShader;
+    return this[cacheKey];
   }
 
   _getNormalShader() {
diff --git a/src/webgl/shaders/phong.frag b/src/webgl/shaders/phong.frag
index 47ec519d47..1b132082f5 100644
--- a/src/webgl/shaders/phong.frag
+++ b/src/webgl/shaders/phong.frag
@@ -11,6 +11,21 @@ uniform vec4 uTint;
 uniform sampler2D uSampler;
 uniform bool isTexture;
 
+// the mtl texture maps only exist in the USE_TEXTURE_MAPS variant of this
+// shader. models that don't use any map get the plain phong shader instead,
+// so none of these samplers/branches are even compiled in for them. dave's
+// call: separate variant rather than branching in one shader that everyone pays for.
+#ifdef USE_TEXTURE_MAPS
+uniform sampler2D uSpecularSampler;
+uniform bool uHasSpecularTex;
+uniform sampler2D uAmbientSampler;
+uniform bool uHasAmbientTex;
+uniform sampler2D uShininessSampler;
+uniform bool uHasShininessTex;
+uniform sampler2D uNormalSampler;
+uniform bool uHasNormalMap;
+#endif
+
 IN vec3 vNormal;
 IN vec2 vTexCoord;
 IN vec3 vViewPosition;
@@ -39,11 +54,40 @@ struct Inputs {
   float metalness;
 };
 
+// build a tangent frame (TBN) from screen-space derivatives, so normal mapping
+// needs no per-vertex tangents. p is the view-space position, uv the texture
+// coords. based on christian schuller's derivative-based tangent method. this
+// uses dFdx/dFdy, which are webgl2 only, so normal mapping is a webgl2 feature.
+#if defined(USE_TEXTURE_MAPS) && defined(WEBGL2)
+mat3 cotangentFrame(vec3 N, vec3 p, vec2 uv) {
+  vec3 dp1 = dFdx(p);
+  vec3 dp2 = dFdy(p);
+  vec2 duv1 = dFdx(uv);
+  vec2 duv2 = dFdy(uv);
+  vec3 dp2perp = cross(dp2, N);
+  vec3 dp1perp = cross(N, dp1);
+  vec3 T = dp2perp * duv1.x + dp1perp * duv2.x;
+  vec3 B = dp2perp * duv1.y + dp1perp * duv2.y;
+  float invmax = inversesqrt(max(dot(T, T), dot(B, B)));
+  return mat3(T * invmax, B * invmax, N);
+}
+#endif
+
 void main(void) {
   HOOK_beforeFragment();
 
   Inputs inputs;
-  inputs.normal = normalize(vNormal);
+  vec3 N = normalize(vNormal);
+#if defined(USE_TEXTURE_MAPS) && defined(WEBGL2)
+  if (uHasNormalMap) {
+    // perturb the normal using a tangent frame derived per pixel, so nothing
+    // extra is uploaded per vertex for models that don't use a normal map.
+    vec3 mapN = TEXTURE(uNormalSampler, vTexCoord).rgb * 2.0 - 1.0;
+    mat3 TBN = cotangentFrame(N, vViewPosition, vTexCoord);
+    N = normalize(TBN * mapN);
+  }
+#endif
+  inputs.normal = N;
   inputs.texCoord = vTexCoord;
   inputs.ambientLight = uAmbientColor;
   inputs.color = isTexture
@@ -54,10 +98,24 @@ void main(void) {
     // so hooks users don't have to think about premultiplied alpha.
     inputs.color.rgb /= inputs.color.a;
   }
-  inputs.shininess = uShininess;
   inputs.metalness = uMetallic;
+#ifdef USE_TEXTURE_MAPS
+  // map variant: shininess/ambient/specular can be modulated by their maps
+  inputs.shininess = uHasShininessTex
+      ? uShininess * TEXTURE(uShininessSampler, vTexCoord).r
+      : uShininess;
+  inputs.ambientMaterial = uHasAmbientTex
+      ? TEXTURE(uAmbientSampler, vTexCoord).rgb * uAmbientMatColor.rgb
+      : (uHasSetAmbient ? uAmbientMatColor.rgb : inputs.color.rgb);
+  inputs.specularMaterial = uHasSpecularTex
+      ? TEXTURE(uSpecularSampler, vTexCoord).rgb * uSpecularMatColor.rgb
+      : uSpecularMatColor.rgb;
+#else
+  // default variant: plain phong, exactly as before this feature existed
+  inputs.shininess = uShininess;
   inputs.ambientMaterial = uHasSetAmbient ? uAmbientMatColor.rgb : inputs.color.rgb;
   inputs.specularMaterial = uSpecularMatColor.rgb;
+#endif
   inputs.emissiveMaterial = uEmissiveMatColor.rgb;
   inputs = HOOK_getPixelInputs(inputs);
 
diff --git a/test/unit/assets/bump_sphere.mtl b/test/unit/assets/bump_sphere.mtl
new file mode 100644
index 0000000000..915d6493b5
--- /dev/null
+++ b/test/unit/assets/bump_sphere.mtl
@@ -0,0 +1,10 @@
+newmtl m0
+Kd 0.8 0.8 0.8
+Ks 0.5 0.5 0.5
+Ns 60
+map_Bump spheremap.jpg
+
+newmtl m1
+Kd 0.8 0.8 0.8
+Ks 0.5 0.5 0.5
+Ns 60
diff --git a/test/unit/assets/bump_sphere.obj b/test/unit/assets/bump_sphere.obj
new file mode 100644
index 0000000000..71701f7fd6
--- /dev/null
+++ b/test/unit/assets/bump_sphere.obj
@@ -0,0 +1,1382 @@
+mtllib bump_sphere.mtl
+v 0.0000 1.0000 0.0000
+v 0.0000 1.0000 0.0000
+v 0.0000 1.0000 0.0000
+v 0.0000 1.0000 0.0000
+v 0.0000 1.0000 0.0000
+v 0.0000 1.0000 0.0000
+v 0.0000 1.0000 0.0000
+v 0.0000 1.0000 0.0000
+v 0.0000 1.0000 0.0000
+v 0.0000 1.0000 0.0000
+v 0.0000 1.0000 0.0000
+v 0.0000 1.0000 0.0000
+v 0.0000 1.0000 0.0000
+v 0.0000 1.0000 0.0000
+v 0.0000 1.0000 0.0000
+v 0.0000 1.0000 0.0000
+v 0.0000 1.0000 0.0000
+v 0.1951 0.9808 0.0000
+v 0.1802 0.9808 0.0747
+v 0.1379 0.9808 0.1379
+v 0.0747 0.9808 0.1802
+v 0.0000 0.9808 0.1951
+v -0.0747 0.9808 0.1802
+v -0.1379 0.9808 0.1379
+v -0.1802 0.9808 0.0747
+v -0.1951 0.9808 0.0000
+v -0.1802 0.9808 -0.0747
+v -0.1379 0.9808 -0.1379
+v -0.0747 0.9808 -0.1802
+v -0.0000 0.9808 -0.1951
+v 0.0747 0.9808 -0.1802
+v 0.1379 0.9808 -0.1379
+v 0.1802 0.9808 -0.0747
+v 0.1951 0.9808 -0.0000
+v 0.3827 0.9239 0.0000
+v 0.3536 0.9239 0.1464
+v 0.2706 0.9239 0.2706
+v 0.1464 0.9239 0.3536
+v 0.0000 0.9239 0.3827
+v -0.1464 0.9239 0.3536
+v -0.2706 0.9239 0.2706
+v -0.3536 0.9239 0.1464
+v -0.3827 0.9239 0.0000
+v -0.3536 0.9239 -0.1464
+v -0.2706 0.9239 -0.2706
+v -0.1464 0.9239 -0.3536
+v -0.0000 0.9239 -0.3827
+v 0.1464 0.9239 -0.3536
+v 0.2706 0.9239 -0.2706
+v 0.3536 0.9239 -0.1464
+v 0.3827 0.9239 -0.0000
+v 0.5556 0.8315 0.0000
+v 0.5133 0.8315 0.2126
+v 0.3928 0.8315 0.3928
+v 0.2126 0.8315 0.5133
+v 0.0000 0.8315 0.5556
+v -0.2126 0.8315 0.5133
+v -0.3928 0.8315 0.3928
+v -0.5133 0.8315 0.2126
+v -0.5556 0.8315 0.0000
+v -0.5133 0.8315 -0.2126
+v -0.3928 0.8315 -0.3928
+v -0.2126 0.8315 -0.5133
+v -0.0000 0.8315 -0.5556
+v 0.2126 0.8315 -0.5133
+v 0.3928 0.8315 -0.3928
+v 0.5133 0.8315 -0.2126
+v 0.5556 0.8315 -0.0000
+v 0.7071 0.7071 0.0000
+v 0.6533 0.7071 0.2706
+v 0.5000 0.7071 0.5000
+v 0.2706 0.7071 0.6533
+v 0.0000 0.7071 0.7071
+v -0.2706 0.7071 0.6533
+v -0.5000 0.7071 0.5000
+v -0.6533 0.7071 0.2706
+v -0.7071 0.7071 0.0000
+v -0.6533 0.7071 -0.2706
+v -0.5000 0.7071 -0.5000
+v -0.2706 0.7071 -0.6533
+v -0.0000 0.7071 -0.7071
+v 0.2706 0.7071 -0.6533
+v 0.5000 0.7071 -0.5000
+v 0.6533 0.7071 -0.2706
+v 0.7071 0.7071 -0.0000
+v 0.8315 0.5556 0.0000
+v 0.7682 0.5556 0.3182
+v 0.5879 0.5556 0.5879
+v 0.3182 0.5556 0.7682
+v 0.0000 0.5556 0.8315
+v -0.3182 0.5556 0.7682
+v -0.5879 0.5556 0.5879
+v -0.7682 0.5556 0.3182
+v -0.8315 0.5556 0.0000
+v -0.7682 0.5556 -0.3182
+v -0.5879 0.5556 -0.5879
+v -0.3182 0.5556 -0.7682
+v -0.0000 0.5556 -0.8315
+v 0.3182 0.5556 -0.7682
+v 0.5879 0.5556 -0.5879
+v 0.7682 0.5556 -0.3182
+v 0.8315 0.5556 -0.0000
+v 0.9239 0.3827 0.0000
+v 0.8536 0.3827 0.3536
+v 0.6533 0.3827 0.6533
+v 0.3536 0.3827 0.8536
+v 0.0000 0.3827 0.9239
+v -0.3536 0.3827 0.8536
+v -0.6533 0.3827 0.6533
+v -0.8536 0.3827 0.3536
+v -0.9239 0.3827 0.0000
+v -0.8536 0.3827 -0.3536
+v -0.6533 0.3827 -0.6533
+v -0.3536 0.3827 -0.8536
+v -0.0000 0.3827 -0.9239
+v 0.3536 0.3827 -0.8536
+v 0.6533 0.3827 -0.6533
+v 0.8536 0.3827 -0.3536
+v 0.9239 0.3827 -0.0000
+v 0.9808 0.1951 0.0000
+v 0.9061 0.1951 0.3753
+v 0.6935 0.1951 0.6935
+v 0.3753 0.1951 0.9061
+v 0.0000 0.1951 0.9808
+v -0.3753 0.1951 0.9061
+v -0.6935 0.1951 0.6935
+v -0.9061 0.1951 0.3753
+v -0.9808 0.1951 0.0000
+v -0.9061 0.1951 -0.3753
+v -0.6935 0.1951 -0.6935
+v -0.3753 0.1951 -0.9061
+v -0.0000 0.1951 -0.9808
+v 0.3753 0.1951 -0.9061
+v 0.6935 0.1951 -0.6935
+v 0.9061 0.1951 -0.3753
+v 0.9808 0.1951 -0.0000
+v 1.0000 0.0000 0.0000
+v 0.9239 0.0000 0.3827
+v 0.7071 0.0000 0.7071
+v 0.3827 0.0000 0.9239
+v 0.0000 0.0000 1.0000
+v -0.3827 0.0000 0.9239
+v -0.7071 0.0000 0.7071
+v -0.9239 0.0000 0.3827
+v -1.0000 0.0000 0.0000
+v -0.9239 0.0000 -0.3827
+v -0.7071 0.0000 -0.7071
+v -0.3827 0.0000 -0.9239
+v -0.0000 0.0000 -1.0000
+v 0.3827 0.0000 -0.9239
+v 0.7071 0.0000 -0.7071
+v 0.9239 0.0000 -0.3827
+v 1.0000 0.0000 -0.0000
+v 0.9808 -0.1951 0.0000
+v 0.9061 -0.1951 0.3753
+v 0.6935 -0.1951 0.6935
+v 0.3753 -0.1951 0.9061
+v 0.0000 -0.1951 0.9808
+v -0.3753 -0.1951 0.9061
+v -0.6935 -0.1951 0.6935
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+f 168/168/168 185/185/185 186/186/186
+f 168/168/168 186/186/186 169/169/169
+f 169/169/169 186/186/186 187/187/187
+f 169/169/169 187/187/187 170/170/170
+f 171/171/171 188/188/188 189/189/189
+f 171/171/171 189/189/189 172/172/172
+f 172/172/172 189/189/189 190/190/190
+f 172/172/172 190/190/190 173/173/173
+f 173/173/173 190/190/190 191/191/191
+f 173/173/173 191/191/191 174/174/174
+f 174/174/174 191/191/191 192/192/192
+f 174/174/174 192/192/192 175/175/175
+f 175/175/175 192/192/192 193/193/193
+f 175/175/175 193/193/193 176/176/176
+f 176/176/176 193/193/193 194/194/194
+f 176/176/176 194/194/194 177/177/177
+f 177/177/177 194/194/194 195/195/195
+f 177/177/177 195/195/195 178/178/178
+f 178/178/178 195/195/195 196/196/196
+f 178/178/178 196/196/196 179/179/179
+f 179/179/179 196/196/196 197/197/197
+f 179/179/179 197/197/197 180/180/180
+f 180/180/180 197/197/197 198/198/198
+f 180/180/180 198/198/198 181/181/181
+f 181/181/181 198/198/198 199/199/199
+f 181/181/181 199/199/199 182/182/182
+f 182/182/182 199/199/199 200/200/200
+f 182/182/182 200/200/200 183/183/183
+f 183/183/183 200/200/200 201/201/201
+f 183/183/183 201/201/201 184/184/184
+f 184/184/184 201/201/201 202/202/202
+f 184/184/184 202/202/202 185/185/185
+f 185/185/185 202/202/202 203/203/203
+f 185/185/185 203/203/203 186/186/186
+f 186/186/186 203/203/203 204/204/204
+f 186/186/186 204/204/204 187/187/187
+f 188/188/188 205/205/205 206/206/206
+f 188/188/188 206/206/206 189/189/189
+f 189/189/189 206/206/206 207/207/207
+f 189/189/189 207/207/207 190/190/190
+f 190/190/190 207/207/207 208/208/208
+f 190/190/190 208/208/208 191/191/191
+f 191/191/191 208/208/208 209/209/209
+f 191/191/191 209/209/209 192/192/192
+f 192/192/192 209/209/209 210/210/210
+f 192/192/192 210/210/210 193/193/193
+f 193/193/193 210/210/210 211/211/211
+f 193/193/193 211/211/211 194/194/194
+f 194/194/194 211/211/211 212/212/212
+f 194/194/194 212/212/212 195/195/195
+f 195/195/195 212/212/212 213/213/213
+f 195/195/195 213/213/213 196/196/196
+f 196/196/196 213/213/213 214/214/214
+f 196/196/196 214/214/214 197/197/197
+f 197/197/197 214/214/214 215/215/215
+f 197/197/197 215/215/215 198/198/198
+f 198/198/198 215/215/215 216/216/216
+f 198/198/198 216/216/216 199/199/199
+f 199/199/199 216/216/216 217/217/217
+f 199/199/199 217/217/217 200/200/200
+f 200/200/200 217/217/217 218/218/218
+f 200/200/200 218/218/218 201/201/201
+f 201/201/201 218/218/218 219/219/219
+f 201/201/201 219/219/219 202/202/202
+f 202/202/202 219/219/219 220/220/220
+f 202/202/202 220/220/220 203/203/203
+f 203/203/203 220/220/220 221/221/221
+f 203/203/203 221/221/221 204/204/204
+f 205/205/205 222/222/222 223/223/223
+f 205/205/205 223/223/223 206/206/206
+f 206/206/206 223/223/223 224/224/224
+f 206/206/206 224/224/224 207/207/207
+f 207/207/207 224/224/224 225/225/225
+f 207/207/207 225/225/225 208/208/208
+f 208/208/208 225/225/225 226/226/226
+f 208/208/208 226/226/226 209/209/209
+f 209/209/209 226/226/226 227/227/227
+f 209/209/209 227/227/227 210/210/210
+f 210/210/210 227/227/227 228/228/228
+f 210/210/210 228/228/228 211/211/211
+f 211/211/211 228/228/228 229/229/229
+f 211/211/211 229/229/229 212/212/212
+f 212/212/212 229/229/229 230/230/230
+f 212/212/212 230/230/230 213/213/213
+f 213/213/213 230/230/230 231/231/231
+f 213/213/213 231/231/231 214/214/214
+f 214/214/214 231/231/231 232/232/232
+f 214/214/214 232/232/232 215/215/215
+f 215/215/215 232/232/232 233/233/233
+f 215/215/215 233/233/233 216/216/216
+f 216/216/216 233/233/233 234/234/234
+f 216/216/216 234/234/234 217/217/217
+f 217/217/217 234/234/234 235/235/235
+f 217/217/217 235/235/235 218/218/218
+f 218/218/218 235/235/235 236/236/236
+f 218/218/218 236/236/236 219/219/219
+f 219/219/219 236/236/236 237/237/237
+f 219/219/219 237/237/237 220/220/220
+f 220/220/220 237/237/237 238/238/238
+f 220/220/220 238/238/238 221/221/221
+f 222/222/222 239/239/239 240/240/240
+f 222/222/222 240/240/240 223/223/223
+f 223/223/223 240/240/240 241/241/241
+f 223/223/223 241/241/241 224/224/224
+f 224/224/224 241/241/241 242/242/242
+f 224/224/224 242/242/242 225/225/225
+f 225/225/225 242/242/242 243/243/243
+f 225/225/225 243/243/243 226/226/226
+f 226/226/226 243/243/243 244/244/244
+f 226/226/226 244/244/244 227/227/227
+f 227/227/227 244/244/244 245/245/245
+f 227/227/227 245/245/245 228/228/228
+f 228/228/228 245/245/245 246/246/246
+f 228/228/228 246/246/246 229/229/229
+f 229/229/229 246/246/246 247/247/247
+f 229/229/229 247/247/247 230/230/230
+f 230/230/230 247/247/247 248/248/248
+f 230/230/230 248/248/248 231/231/231
+f 231/231/231 248/248/248 249/249/249
+f 231/231/231 249/249/249 232/232/232
+f 232/232/232 249/249/249 250/250/250
+f 232/232/232 250/250/250 233/233/233
+f 233/233/233 250/250/250 251/251/251
+f 233/233/233 251/251/251 234/234/234
+f 234/234/234 251/251/251 252/252/252
+f 234/234/234 252/252/252 235/235/235
+f 235/235/235 252/252/252 253/253/253
+f 235/235/235 253/253/253 236/236/236
+f 236/236/236 253/253/253 254/254/254
+f 236/236/236 254/254/254 237/237/237
+f 237/237/237 254/254/254 255/255/255
+f 237/237/237 255/255/255 238/238/238
+f 239/239/239 256/256/256 257/257/257
+f 239/239/239 257/257/257 240/240/240
+f 240/240/240 257/257/257 258/258/258
+f 240/240/240 258/258/258 241/241/241
+f 241/241/241 258/258/258 259/259/259
+f 241/241/241 259/259/259 242/242/242
+f 242/242/242 259/259/259 260/260/260
+f 242/242/242 260/260/260 243/243/243
+f 243/243/243 260/260/260 261/261/261
+f 243/243/243 261/261/261 244/244/244
+f 244/244/244 261/261/261 262/262/262
+f 244/244/244 262/262/262 245/245/245
+f 245/245/245 262/262/262 263/263/263
+f 245/245/245 263/263/263 246/246/246
+f 246/246/246 263/263/263 264/264/264
+f 246/246/246 264/264/264 247/247/247
+f 247/247/247 264/264/264 265/265/265
+f 247/247/247 265/265/265 248/248/248
+f 248/248/248 265/265/265 266/266/266
+f 248/248/248 266/266/266 249/249/249
+f 249/249/249 266/266/266 267/267/267
+f 249/249/249 267/267/267 250/250/250
+f 250/250/250 267/267/267 268/268/268
+f 250/250/250 268/268/268 251/251/251
+f 251/251/251 268/268/268 269/269/269
+f 251/251/251 269/269/269 252/252/252
+f 252/252/252 269/269/269 270/270/270
+f 252/252/252 270/270/270 253/253/253
+f 253/253/253 270/270/270 271/271/271
+f 253/253/253 271/271/271 254/254/254
+f 254/254/254 271/271/271 272/272/272
+f 254/254/254 272/272/272 255/255/255
+f 256/256/256 273/273/273 274/274/274
+f 256/256/256 274/274/274 257/257/257
+f 257/257/257 274/274/274 275/275/275
+f 257/257/257 275/275/275 258/258/258
+f 258/258/258 275/275/275 276/276/276
+f 258/258/258 276/276/276 259/259/259
+f 259/259/259 276/276/276 277/277/277
+f 259/259/259 277/277/277 260/260/260
+f 260/260/260 277/277/277 278/278/278
+f 260/260/260 278/278/278 261/261/261
+f 261/261/261 278/278/278 279/279/279
+f 261/261/261 279/279/279 262/262/262
+f 262/262/262 279/279/279 280/280/280
+f 262/262/262 280/280/280 263/263/263
+f 263/263/263 280/280/280 281/281/281
+f 263/263/263 281/281/281 264/264/264
+f 264/264/264 281/281/281 282/282/282
+f 264/264/264 282/282/282 265/265/265
+f 265/265/265 282/282/282 283/283/283
+f 265/265/265 283/283/283 266/266/266
+f 266/266/266 283/283/283 284/284/284
+f 266/266/266 284/284/284 267/267/267
+f 267/267/267 284/284/284 285/285/285
+f 267/267/267 285/285/285 268/268/268
+f 268/268/268 285/285/285 286/286/286
+f 268/268/268 286/286/286 269/269/269
+f 269/269/269 286/286/286 287/287/287
+f 269/269/269 287/287/287 270/270/270
+f 270/270/270 287/287/287 288/288/288
+f 270/270/270 288/288/288 271/271/271
+f 271/271/271 288/288/288 289/289/289
+f 271/271/271 289/289/289 272/272/272
diff --git a/test/unit/assets/normal_mapped.mtl b/test/unit/assets/normal_mapped.mtl
new file mode 100644
index 0000000000..75391a4a70
--- /dev/null
+++ b/test/unit/assets/normal_mapped.mtl
@@ -0,0 +1,6 @@
+newmtl m0
+Kd 0.8 0.8 0.8
+map_Bump spheremap.jpg
+
+newmtl m1
+Kd 0.5 0.5 0.5
diff --git a/test/unit/assets/normal_mapped.obj b/test/unit/assets/normal_mapped.obj
new file mode 100644
index 0000000000..971557ca7f
--- /dev/null
+++ b/test/unit/assets/normal_mapped.obj
@@ -0,0 +1,17 @@
+mtllib normal_mapped.mtl
+v 0 0 0
+v 1 0 0
+v 0 1 0
+v 1 1 0
+vt 0 0
+vt 1 0
+vt 0 1
+vt 1 1
+vn 0 0 1
+vn 0 0 1
+vn 0 0 1
+vn 0 0 1
+usemtl m0
+f 1/1/1 2/2/2 3/3/3
+usemtl m1
+f 2/2/2 4/4/4 3/3/3
diff --git a/test/unit/io/loadModel.js b/test/unit/io/loadModel.js
index 0c2efa9cf7..f94bd68c15 100644
--- a/test/unit/io/loadModel.js
+++ b/test/unit/io/loadModel.js
@@ -116,6 +116,24 @@ suite('loadModel', function () {
     }
   });
 
+  test('a normal-mapped OBJ carries the normal map on its part', async function () {
+    const fakeImage = { width: 1, height: 1 };
+    mockP5Prototype.loadImage = async () => fakeImage;
+    try {
+      const model = await mockP5Prototype.loadModel(
+        '/test/unit/assets/normal_mapped.obj'
+      );
+      // two materials, so two parts
+      assert.equal(model.parts.length, 2);
+      // the part with the normal map carries it
+      const normalMapped = model.parts.find(p => p.partState.normalTexture);
+      assert.ok(normalMapped, 'a part has the normal map');
+      assert.equal(normalMapped.partState.normalTexture, fakeImage);
+    } finally {
+      delete mockP5Prototype.loadImage;
+    }
+  });
+
   test('a texture that fails to load is skipped without failing the model', async function () {
     mockP5Prototype.loadImage = async () => {
       throw new Error('Not Found');
diff --git a/test/unit/io/parseMtl.js b/test/unit/io/parseMtl.js
index c01ef7947a..1a7dc30c17 100644
--- a/test/unit/io/parseMtl.js
+++ b/test/unit/io/parseMtl.js
@@ -13,6 +13,7 @@ suite('parseMtlData', function () {
       'map_Kd diffuse.png',
       'map_Ka ambient.png',
       'map_Ks specular.png',
+      'map_Ns shininess.png',
       'map_Bump -bm 0.5 bump.png'
     ].join('\n');
 
@@ -28,6 +29,7 @@ suite('parseMtlData', function () {
     expect(m.texturePath).toEqual('diffuse.png');
     expect(m.ambientTexturePath).toEqual('ambient.png');
     expect(m.specularTexturePath).toEqual('specular.png');
+    expect(m.shininessTexturePath).toEqual('shininess.png');
     // bump options like -bm precede the path, so the path is the last token.
     expect(m.bumpTexturePath).toEqual('bump.png');
   });
@@ -69,4 +71,44 @@ suite('mtlToPartState', function () {
     expect(state.fill).toBeNull();
     expect(state.texture).toBeNull();
   });
+
+  test('a specular map lands on the part state with a white base', function () {
+    const img = { width: 1, height: 1 };
+    const state = mtlToPartState({ specularTexture: img });
+    expect(state.specularTexture).toBe(img);
+    // with no explicit Ks, the base specular colour defaults to white so the
+    // map has something to modulate
+    expect(state.specularColor).toEqual([1, 1, 1]);
+  });
+
+  test('a specular map keeps an explicit Ks colour', function () {
+    const img = { width: 1, height: 1 };
+    const state = mtlToPartState({
+      specularColor: [0.5, 0.5, 0.5],
+      specularTexture: img
+    });
+    expect(state.specularTexture).toBe(img);
+    expect(state.specularColor).toEqual([0.5, 0.5, 0.5]);
+  });
+
+  test('an ambient map lands on the part state with a white base', function () {
+    const img = { width: 1, height: 1 };
+    const state = mtlToPartState({ ambientTexture: img });
+    expect(state.ambientTexture).toBe(img);
+    expect(state.ambientColor).toEqual([1, 1, 1]);
+  });
+
+  test('a shininess map lands on the part state', function () {
+    const img = { width: 1, height: 1 };
+    const state = mtlToPartState({ shininessTexture: img });
+    expect(state.shininessTexture).toBe(img);
+    // the map scales a base shininess, which defaults to 1
+    expect(state.shininess).toEqual(1);
+  });
+
+  test('a normal map lands on the part state', function () {
+    const img = { width: 1, height: 1 };
+    const state = mtlToPartState({ normalTexture: img });
+    expect(state.normalTexture).toBe(img);
+  });
 });
diff --git a/test/unit/visual/cases/webgl.js b/test/unit/visual/cases/webgl.js
index ed2af5fdc6..e43e59007e 100644
--- a/test/unit/visual/cases/webgl.js
+++ b/test/unit/visual/cases/webgl.js
@@ -411,6 +411,23 @@ visualSuite('WebGL', function () {
         screenshot();
       }
     );
+    visualTest(
+      'a normal-mapped sphere shows surface detail under light',
+      async function (p5, screenshot) {
+        p5.createCanvas(50, 50, p5.WEBGL);
+        // the top half of bump_sphere.obj uses a normal map, the bottom is plain,
+        // so under a light the top shows surface detail and the bottom stays smooth
+        const model = await new Promise(resolve =>
+          p5.loadModel('test/unit/assets/bump_sphere.obj', resolve)
+        );
+        p5.background(255);
+        p5.pointLight(255, 255, 255, 100, -100, 200);
+        p5.noStroke();
+        p5.scale(22);
+        p5.model(model);
+        screenshot();
+      }
+    );
   });
 
   visualSuite('vertexProperty', function () {
diff --git a/test/unit/visual/screenshots/WebGL/3DModel/a normal-mapped sphere shows surface detail under light/000.png b/test/unit/visual/screenshots/WebGL/3DModel/a normal-mapped sphere shows surface detail under light/000.png
new file mode 100644
index 0000000000..a4d937fe35
Binary files /dev/null and b/test/unit/visual/screenshots/WebGL/3DModel/a normal-mapped sphere shows surface detail under light/000.png differ
diff --git a/test/unit/visual/screenshots/WebGL/3DModel/a normal-mapped sphere shows surface detail under light/metadata.json b/test/unit/visual/screenshots/WebGL/3DModel/a normal-mapped sphere shows surface detail under light/metadata.json
new file mode 100644
index 0000000000..2d4bfe30da
--- /dev/null
+++ b/test/unit/visual/screenshots/WebGL/3DModel/a normal-mapped sphere shows surface detail under light/metadata.json	
@@ -0,0 +1,3 @@
+{
+  "numScreenshots": 1
+}
\ No newline at end of file
diff --git a/test/unit/webgl/p5.GeometryPart.js b/test/unit/webgl/p5.GeometryPart.js
index 00cde74b0b..e13e0a1e8e 100644
--- a/test/unit/webgl/p5.GeometryPart.js
+++ b/test/unit/webgl/p5.GeometryPart.js
@@ -40,7 +40,11 @@ suite('p5.GeometryPart', function () {
       ambientColor: null,
       specularColor: null,
       shininess: null,
-      texture: null
+      texture: null,
+      specularTexture: null,
+      ambientTexture: null,
+      shininessTexture: null,
+      normalTexture: null
     });
   });