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CS770/870

CS770/870. Class 5. Assignment 2. Create an articulated mannequin Has body, head Two arms with elbow joint Hand. Some basic 3D setup commands. glFrustum ( Left,Right , Bottom, Top, Near, Far); float light_position [] = {-10.0,20.0,20.0,1.0};

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CS770/870

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  1. CS770/870 Class 5

  2. Assignment 2 Create an articulated mannequin Has body, head Two arms with elbow joint Hand

  3. Some basic 3D setup commands • glFrustum(Left,Right, Bottom, Top, Near, Far); • float light_position[] = {-10.0,20.0,20.0,1.0}; • glLightfv(GL_LIGHT0,GL_POSITION, light_position); • glEnable(GL_COLOR_MATERIAL); • This allows you to color basic glut objects (sphere, cube) • glEnable(GL_LIGHTING); • glEnable(GL_NORMALIZE); • This enables you to scale a cube without messing up lighting • Why? • glutSolid Sphere(rad, lat, lon); • glutSolidCube(size);

  4. GL_PROJECTION GL_PROJECTION GL_MODELVIEW M  P Mv The only difference between Projection (P) and Modelview (Mv) is that you cannot pop P off the stack, and P is always applied. A RIGHT HANDED COORDINATE SYSTEM

  5. Order of rotations To rotate around an arbitrary point on an object and not have it move. Must translate to the center of rotation, rotate, translate back again. (Beware of scales) All rotations occur in your initial frame of reference + looking a positive direction along an axis. Exercise

  6. Use of Matrix Stack. • Push • Rotate Torso • Draw Torso • Push • Translate, Rotate and draw Right arm • + Deal with forearm and hand (more pushes and pops) • Pop • Push • Translate, Rotate and draw Right arm • +Deal with forearm and hand • Pop • Pop

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