What is Shading Assigning of a color to

What impacts shading? • • The lights in a scene. The geometry of objects

The Original CG Shading Techniques • Faceted Shading • Smooth Shading • Specular Shading

What is a Normal? Eyepoint Light Normal Reflected Light Plane Eyepoint Normal Plane Reflected

Next: Surface Shaders • A grouping of all variables that influence the rendered color

Surface Layers • Combine multiple shaders for astonishing effects. • Build up shades like

Renderman Shaders • • Renderman is a procedural shader language with tremendous versatility. All

Image Mapping • • • Generally referred to as Texture Mapping. 2 D Texture

Surface Reflectivity • • • Ambient Reflection Diffuse Reflection Specular Reflection maps Environment Maps

Surface Texture/Roughness • • • Visual textures – like brick wallpaper. Spatial textures/roughness –

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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. 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 • Faceted Shading • Smooth Shading • Specular Shading

What is a Normal? Eyepoint Light Normal Reflected Light Plane Eyepoint Normal Plane Reflected Light

Faceted/Flat Shading

Smooth/Gouraud Shading

Specular/Phong Shading

Next: Surface Shaders • A grouping of all variables that influence the rendered color of a 3 D object. • Surface finish • Simulated material. • Surface libraries/material databases. • Surface Layers • Render. Man Shading

Surface Layers • Combine multiple shaders for astonishing effects. • Build up shades like a painter.

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 • • • Generally referred to as Texture Mapping. 2 D Texture Mapping Creating the map Maps for real-time Maps for feature film

1 Map Many Attributes

1 Map Many Parts

Image Mapping in Games

Image Mapping in Film

Projection Methods

Positioning the Map

Map Blending

Surface Reflectivity • • • Ambient Reflection Diffuse Reflection Specular Reflection maps Environment Maps Glow/Incandescence

Surface Reflectivity

Reflection/Environment Maps

Color Maps

Surface Texture/Roughness • • • Visual textures – like brick wallpaper. Spatial textures/roughness – mod geometry. Bump maps – modify surface normals. Displacement maps 2 D Procedural `Texture’ maps. 3 D Procedural `Texture’ maps.

2 d Procedural texture maps