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Shading - PowerPoint PPT Presentation


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Shading What is Shading? Assigning of a color to a pixel in the final image. So, everything in shading is about how to select and combine colors to get the look you want. What impacts shading? The lights in a scene. The geometry of objects in a scene. The normals of objects.

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Presentation Transcript
what is shading
What is Shading?
  • Assigning of a color to a pixel in the final image.
  • So, everything in shading is about how to select and combine colors to get the look you want.
what impacts shading
What impacts shading?
  • The lights in a scene.
  • The geometry of objects in a scene.
  • The normals of objects.
  • The shader properties of an object:
    • Color,transparency, emissivity, etc…
  • The rendering algorithm
    • Eg ray-tracing versus scan-line rendering.
the original cg shading techniques
The Original CG Shading Techniques
  • Faceted Shading
  • Smooth Shading
  • Specular Shading
what is a normal
What is a Normal?

Eyepoint

Light

Normal

Reflected Light

Plane

Eyepoint

Normal

Reflected Light

Plane

next surface shaders
Next: Surface Shaders
  • A grouping of all variables that influence the rendered color of a 3D object.
  • Surface finish
  • Simulated material.
  • Surface libraries/material databases.
  • Surface Layers
  • RenderMan Shading
surface layers
Surface Layers
  • Combine multiple shaders for astonishing effects.
  • Build up shades like a painter.
renderman shaders
Renderman Shaders
  • Renderman is a procedural shader language with tremendous versatility.
  • All major feature animated feature films use Renderman as part of production.
  • Like programming in C code.
  • You write Shaders for Renderman like you would write C code for computers.
image mapping
Image Mapping
  • Generally referred to as Texture Mapping.
  • 2D Texture Mapping
  • Creating the map
  • Maps for real-time
  • Maps for feature film
surface reflectivity
Surface Reflectivity
  • Ambient Reflection
  • Diffuse Reflection
  • Specular Reflection
  • Reflection maps
  • Environment Maps
  • Glow/Incandescence
surface texture roughness
Surface Texture/Roughness
  • Visual textures – like brick wallpaper.
  • Spatial textures/roughness – mod geometry.
  • Bump maps – modify surface normals.
  • Displacement maps
  • 2D Procedural `Texture’ maps.
  • 3D Procedural `Texture’ maps.