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-- ChrisWilson - 05 Oct 2004

I started testing the physics engine of the prototype today. Since we're dealing with a standardized triangle, I'm feeding the engine various ball positions and velocities to see if it detects a collision. The standardized triangle is located at ((0, 0, 0), (1, 0, 1), (1, 0, 0)). Among the values tested:

Testing surface collision:

• Ball=(.2, 5, .2), Velocity=(0, -10, 0), Radius=1, returned alpha=0.40202
• Ball=(.2, 10.9, .2), Velocity=(0, -10, 0), Radius=1, returned alpha=0.99202
• Ball=(2, 2, 2), Velocity=(-2, -2, -2), Radius=1, returned alpha=0.64646

Testing edge collision:

• Ball=(.5, 0, -1), Velocity=(0, 0, 10), Radius=1, returned alpha=0
• Ball=(.5, 0, -10), Velocity=(0, 0, 10), Radius=1, returned alpha=0.9

Testing vertex collision:

• Ball=(0, 1, 0), Velocity=(0, 1, 0), Radius=1, returned alpha=0
• Ball=(0, 1.999, 0), Velocity=(0, 1, 0), Radius=1, returned alpha=0.999

Testing non-collisions:

• Ball=(0, 2, 0), Velocity=(0, 1, 0), Radius=1, returned alpha=1
• Ball=(5, 5, 5), Velocity=(0, -10, 0), Radius=1, returned alpha=1
• Ball=(2, 2, 2), Velocity=(-1, -1, -1), Radius=1, returned alpha=1

-- ChrisWilson - 06 Oct 2004