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Introduction of OpenGL - 3D Graphic and Animation

Introduction of OpenGL - 3D Graphic and Animation. Luke Yulu Chen. 3D Graphic. Projections – Getting 3D to 2D. Two Projections. Orthographic Projection Perspective Projection. Orthographic. Perspective. Orthographic Projections. Command

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Introduction of OpenGL - 3D Graphic and Animation

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  1. Introduction of OpenGL- 3D Graphic and Animation Luke Yulu Chen

  2. 3D Graphic • Projections – Getting 3D to 2D

  3. Two Projections • Orthographic Projection • Perspective Projection Orthographic Perspective

  4. Orthographic Projections • Command • glOrtho ( double left, double right, double bottom, double top, double near, double far);

  5. Perspective Projection • Command • gluPerspective ( double angle, double aspect, double near, double far);

  6. Draw a 3D Model • Object Composition Polygon 3D Model

  7. Object Composition • Use Transformation • glPushMatrix ( ); • glPopMatrix ( ); • Save the current transformation state and then restore it after some objects have been placed

  8. Wheele 4 Wheele 3 Wheele 2 Wheele 1 The Car Body The Matrix Stack • Ex. Draw a car use transformation • The car body and four wheeles Transformation state Wheele 4

  9. Hidden Surface Hidden Surface Removal • Enable Depth Testing • glEnable (GL_DEPTH_TEST);

  10. Light and Surface Normal • A Normal Vector V3 = V1 X V2 Normal Vector P3 V2 P1 V1 P2

  11. Draw Quadrics (1) • Rendering Spheres, Cylinders, and Disks • 1. Declare a quadrics pointer • GLUquadricObj *qobj; • 2. Create a quadrics object • qobj = gluNewQuadric ( );

  12. Draw Quadrics (2) • Rendering Spheres, Cylinders, and Disks • 3. Specify the rendering attributes for the quadrics object • gluDrawStyle (qobj, GLU_FILL); • gluQuadricOrientation (qobj, GLU_OUTSIDE); • gluQuadricNormals (qobj, GLU_SMOOTH);

  13. Draw Quadrics (3) • Rendering Spheres, Cylinders, and Disks • 4. Draw quadrics object • gluSphere (qobj, radius, slices, stacks); • gluCylinder (qobj, baseRadius, topRadius, height, slices, stacks); • gluDisk (qobj, innerRadius, outerRadius, slices, rings);

  14. Draw Quadrics (4) • Rendering Spheres, Cylinders, and Disks • Slices and stacks Cylinder slices = 6 stacks = 6 Cylinder slices = 30 stacks = 30

  15. Draw Quadrics (5) • Rendering Spheres, Cylinders, and Disks • 5. When you’re completely finished with drawing, destory this object • gluDeleteQuadric ( );

  16. Animation • A Rotating Square Frame 0 Frame 1 Frame 2 Frame 3

  17. Animation with OpenGL and GLUT • Motion = Redraw + Swap • Double Buffering • One is displayed while the other is being drawing. When the drawing of a frame is complete, the two buffers are swapped • glutSwapBuffers ( );

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