By Dave Shreiner, Ed Angel, Vicki Shreiner
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Extra resources for An Interactive Introduction to OpenGL Programming
G. glRotate(), glTranslate(), and glScale(). For the basic viewing transformations, OpenGL and the Utility library have supporting functions. 39 An Interactive Introduction to OpenGL Programming Programming Transformations Prior to rendering, view, locate, and orient: • eye/camera position • 3D geometry Manage the matrices • including matrix stack Combine (composite) transformations 40 Because transformation matrices are part of the state, they must be defined prior to any vertices to which they are to apply.
We first (last transformation in code) move it to the origin. Then we rotate about the axis (ax, ay, az) and finally move fixed point back. 57 An Interactive Introduction to OpenGL Programming Additional Clipping Planes At least 6 more clipping planes available Good for cross-sections Modelview matrix moves clipping plane Ax + By + Cz + D < 0 clipped glEnable( GL_CLIP_PLANEi ) glClipPlane( GL_CLIP_PLANEi, GLdouble* coeff ) 58 Use of additional clipping places may slow rendering as they are usually implemented in software.
The command-manipulation menu allows you to change the order of the glTranslatef() and glRotatef() commands. Later, we will see the effect of changing the order of modeling commands. 48 An Interactive Introduction to OpenGL Programming Connection: Viewing and Modeling Moving camera is equivalent to moving every object in the world towards a stationary camera Viewing transformations are equivalent to several modeling transformations gluLookAt() has its own command can make your own polar view or pilot view 49 Instead of gluLookAt(, one can use the following combinations of glTranslate() and glRotate() to achieve a viewing transformation.
An Interactive Introduction to OpenGL Programming by Dave Shreiner, Ed Angel, Vicki Shreiner