CS488/688 A3 Marking

NOTE: The deductions listed on these and other Marking pages are guidelines only and are subject to TA discretion including, but not limited to, the number of marks deducted. We generally expect students to make "reasonable" decisions as well as reasonable effort in complete and correct implementations.

A3:

• The head should not be rotated into body when two buttons are depressed in the same time
• Picking should work after the position of puppet has changed
• The orientation of trackball should be correct, regardless of whether the puppet is facing us or facing away.
• Trackball transformations should be premultiplied, otherwise the rotation is inconsistent once you have flipped the puppet.
• Trackball & translation/zoom should be kept on separate nodes so you don't rotate around the origin
• When calling your hierchical traversal routine for picking, remember to do your initial view translations as well.
• Document your transformation nodes as well.
• You need transformation nodes above each joint so rotation doesn't occur around the center of spheres.
• To get the togl raster to fill the whole window, you need to set parameters in the raster and the raster's parent frame as well.
• If your puppet's movement are jerky, it is because you didn't use a display list, or your spheres are tessellated too finely.
• You need to turn on cull face for backfacing polygon removal
• You should scale the trackball by 180 degrees to get the 180 degree rotations.
• You need to make the diameter of the trackball 1/2 of min (screen width, screen height) so it will conform to the circle.
• Your rotations for the head should be called on different joints so the head won't rotate into the body.
• Implement short cut keys!!!