teaching machines

CS 455 Lecture 6 – Matrix Implementation and Orthographic Transformations

February 6, 2013 by Chris Johnson. Filed under cs455, lectures, spring 2013.

Before Class

Vector and Matrix Implementation

• Watch http://youtu.be/oanx1G_76JI.
• Bring these implementations to class on Thursday.

Viewport and Orthogonal Projection Transformations

• Watch http://youtu.be/TlN4q3zt1tw.
• Bring the GetOrthographic method implementation to class on Thursday.

In class

• Building on your work from Tuesday, incorporate your Matrix4 class to do the transformations.
• Add an orthographic projection to show the object space [-100, -100, -100] to [100, 100, 100]. There’s a model that fills this space in W455/figure.obj. You’ll need to adjust the Z-scaling factor in Matrix4::GetOrtho to 2.0f / (n – f). Otherwise, you’ll see only a cross-section of your figure. Vertices with z < -1 or z > 1 will get clipped.

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