Ray tracing is a rendering technique that traces the path of light rays through pixels in an image to simulate effects like shadows, reflections, and refractions. It works by emitting rays for each pixel and finding intersections with surfaces to compute the color based on lighting information like ambient light, diffuse color, and specular highlights. While more realistic than rasterization, ray tracing is slower and less optimized for GPUs.

1. Render techniques overview
Ray tracing

2. •What rendering is
•Rendering techniques
•Ray tracing
•Hi render

3. What rendering is
Geometry
Texture
Lights
Camera
ImageRender
Model
Bones
Key frames

4. Render techniques
Rasterization Ray tracing
• Start from geometry
• For each polygon
• Start from pixels
• For each pixel

5. Ray tracing algorithm
• Emit ray for each pixel
For each ray:
• Find first intersection
• Compute color based on surface

6. Pixel color computing
• Lightness in point
• Directional light
• Ambient light / AO
• Color in point
• Diffuse color
• Specular color
• Ambient color
• Emissive color

7. Advantages
• Parallel computing
• Shadows
• Reflections and refractions
• Indirect illumination possible
Disadvantages
• Slow renderer
• Not optimized for GPUs
• Antialiasing is expensive
• Doesn’t scale so well

8. Hi Render

9. Render techniques overview
Ray tracing