Rendering, OpenGL, and Lighting - Caltech

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OpenGL geometry/rendering• How do we use these transformations torender triangles?// set up transformations...glBegin(GL_TRIANGLES);glVertex3f(x1, y1, z1);glVertex3f(x2, y2, z2);glVertex3f(x3, y3, z3);// more sets of 3 vertices for more trianglesglEnd();• Add glNormal3f(xi, yi, zi) calls beforeglVertex3f calls to attach normals to vertices
OpenGL geometry/rendering• glShade(GL_SMOOTH / GL_FLAT)– Tells OpenGL whether to use per-vertex lighting(Gouraud) or per-face lighting (flat)– For fixed pipeline, this won’t matter when we useGPU shaders (we'll override the default lighting)• Lighting functions to set up light state– Same for material properties– Generally done during initialization; take a look athomework 1 code to see how it’s done– Light and material state can be read in GPU code,so it’s still useful
Page 3: Spaces• Object space (also called
Page 6 and 7: Spaces• (Clipped) Normalized Devi
Page 8 and 9: SpacesNominally, the spaces are rel
Page 10 and 11: Transformations• Matrix multiplic
Page 12 and 13: Transformations• Rotation is more
Page 14 and 15: Transformations• Projection trans
Page 16 and 17: Rasterization• Draw triangles fro
Page 18 and 19: OpenGL• So what does OpenGL do?-
Page 20 and 21: OpenGL transformation stacks• Sta
Page 22 and 23: OpenGL transformations• Function
Page 26 and 27: How to render with OpenGL• Initia
Page 28 and 29: Simple lighting models• Flat, Gou
Page 30 and 31: Simple lighting models• The rende
Page 32 and 33: Specular lighting• Specular compo
Page 34 and 35: Homework 1• Implement per-pixel l
Page 36 and 37: Recitation contents• Explanation
Page 38 and 39: Simple lighting models• Diffuse c
Page 40 and 41: Simple lighting models• Overall l
Page 42 and 43: Blinn shading
Page 44 and 45: Phong shading (pixels)
Page 46 and 47: Default OpenGL pipelineVertex dataW
Page 48 and 49: Notes on GLSL pipeline• The verte
Page 50 and 51: Fragment shaders• Fragment shader
Page 52 and 53: GLSL syntax and programming• GLSL
Page 54 and 55: GLSL built-in variables• Handy re
Page 56 and 57: Fragment shader built-in variables
Page 58 and 59: Built-in functions• dot() - takes
Page 60 and 61: Sample vertex shaderuniform int amb
Page 62 and 63: Using shaders• Example included i

Rendering, OpenGL, and Lighting - Caltech

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