- Point Lights
- Bloom
For the bloom effect, I created an additional G buffer to store the materials with bloom. Materials with Ka greater than 0 are assigned a value of 1, while materials with a Ka of 0 and therefore doesn't glow are assigned a value of 0. I then apply a simple Gaussian blur to the map and do an additive blend between the base color of the material and the glow.
- Toon shading
For toon shading, I used a Sobel filter for basic edge detection. To create cel shading effect, I simply find the dot product between the normal and the vector from the position to the light, and shade it based on the angle between these 2 vectors.
- Screen Space Ambient Occlusion
I based my implementation off of last year's GLSL project.
Here is a video of my deferred shader running.
Number of Lights
With scissor test, nearly 3000 lights can be rendered without a major performance hit. After 3000 lights, however, the number of texture reads becomes very high and there is a sharp drop in performance. Without the scissor test, the scene can barely handle 700 lights.
Number of neighbors sampled for bloom effect
When blurring the glow texture, FPS stays at 60 when the number of samples taken is under 64. When the number of samples go above 64, performance decreases to about 30 FPS since the number of texture reads become very high.
- For screen space ambient occlusion, I used the base code from project 5 of the CIS565 fall 2012 class.
This project makes use of tinyobjloader and SOIL