CSC 240 Computer Graphics. Fall 2015 Smith College

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1 CSC 240 Computer Graphics Fall 2015 Smith College

2 Outline: 11/9 Stacks revisited Shading (using normal vectors) Texture Mapping Final quiz If time: robot with two arms White background slides from Eitan Mendelowitz

3 Current Matrix

4 Add a transformation: matrix multiplication (right) Current Matrix x

5 Replace current matrix with result Current Matrix

6 PUSH: Add current matrix to the matrix stack Current Matrix

7 Add another transformation: matrix multiplication (right) Current Matrix x

8 Replace current matrix with result Current Matrix

9 PUSH: Add current matrix to the matrix stack Current Matrix

10 Add another transformation: matrix multiplication (right) Current Matrix x

11 Replace current matrix with result Current Matrix

12 POP: Completely get rid of current matrix and pop from the top of the stack Current Matrix

13 Back to where we were before Current Matrix

14 Add another transformation: matrix multiplication (right) Current Matrix x

15 Replace current matrix with result Current Matrix

16 POP: Completely get rid of current matrix and pop from the top of the stack Current Matrix

17 Back to the beginning Current Matrix

18 Shading in OpenGL

19 Lighting is determined by the surface s angle to the light source

20 Lighting is determined by the surface s angle to the light source (as defined by the surface normal) Surface Normal

21 Lighting is determined by the surface s angle to the light source (as defined by the surface normal) Surface Normal

22 Lighting is determined by the surface s angle to the light source (as defined by the surface normal) Surface Normal

23 Lighting is determined by the surface s angle to the light source (as defined by the surface normal) Surface Normal

24 Lighting is determined by the surface s angle to the light source (as defined by the surface normal) Surface Normal

25 Suppose Poly based Normals

26 Vertex based Normals

27 Interpolated Surface Normals glshademodel(gl_smooth)

28 glshademodel(gl_flat) glshademodel(gl_smooth)

29 Begin: Texture Mapping (next time: texture mapping lab)

30 Texture Mapping! is how far along AB you are. " is how far along AC you are.!, " are [0,1] " c a! b

31 Texture Mapping 0,1 v c 0,0 1,0 u " Texture Coordinates a! b

32 Texture Mapping 0,1 v c 0,0 1,0 u " Texture Coordinates a! b

33 Texture Mapping 0,1 v c 0,0 1,0 u " Texture Coordinates a! b

34 Exercise: what image does this code produce? void display(void) { glclear(gl_color_buffer_bit GL_DEPTH_BUFFER_BIT); glenable(gl_texture_2d); gltexenvf(gl_texture_env, GL_TEXTURE_ENV_MODE, GL_DECAL); glbindtexture(gl_texture_2d, texname); glbegin(gl_quads); gltexcoord2f(0.0, 0.0); glvertex3f(-2.0, -1.0, 0.0); gltexcoord2f(0.0, 1.0); glvertex3f(-2.0, 1.0, 0.0); gltexcoord2f(1.0, 1.0); glvertex3f(0.0, 1.0, 0.0); gltexcoord2f(1.0, 0.0); glvertex3f(0.0, -1.0, 0.0); gltexcoord2f(0.0, 0.0); glvertex3f(1.0, -1.0, 0.0); gltexcoord2f(0.0, 1.0); glvertex3f(1.0, 1.0, 0.0); gltexcoord2f(1.0, 1.0); glvertex3f( , 1.0, ); gltexcoord2f(1.0, 0.0); glvertex3f( , -1.0, ); glend(); } glflush(); gldisable(gl_texture_2d);

35 Image Produced OpenGL Redbook, Chapter 9, Figure 9-2

36 Bump Mapping "Bump-map-demo-full

37 Final quiz In-class on Monday 12/14 One study sheet (hand-written, front and back) Focus on the theoretical aspects of the second half of the semester Reasons: Quiz earlier so there is time for final project Self-scheduled exam period is very late Helps you study in a focused manner

Lecture 22 Sections 8.8, 8.9, Wed, Oct 28, 2009

s The s Lecture 22 Sections 8.8, 8.9, 8.10 Hampden-Sydney College Wed, Oct 28, 2009 Outline s The 1 2 3 4 5 The 6 7 8 Outline s The 1 2 3 4 5 The 6 7 8 Creating Images s The To create a texture image internally,