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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.

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Presentation on theme: "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."— Presentation transcript:

1 Shading

2 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.

3 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.

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

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

6 Faceted/Flat Shading

7 Smooth/Gouraud Shading

8 Specular/Phong Shading

9 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

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

11 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.

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

13 1 Map Many Attributes

14 1 Map Many Parts

15 Image Mapping in Games

16 Image Mapping in Film

17 Projection Methods

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19 Positioning the Map

20 Map Blending

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

22 Surface Reflectivity

23 Reflection/Environment Maps

24 Color Maps

25 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.

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29 Bump Map Example

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31 2d Procedural texture maps

32 3D Procedural texture maps


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