Elasticity

Game Engine Game Engine Support and Discussion
1

Hi Doc,

Construct a cube, subdivide it a few times, and assigne two materials: low_bounce and high_bounce to different faces of this cube. Flatten the cube to create a large floor area. Assign elasticity of .3 to the low_bounce and elasticity of 1 to the high_bounce cube. Then, assign elasticity =1 to a ball (a small icosphere). Duplicate this ball, and make them both into rigid bodies. Start the two balls at the same height, each one over a region of different material.

My expectation: the balls should bounce to different levels. They do not. Also: change the cube (multi-material) to ghost, and the ball still bounces. Clearly a bug.

Link: http://www.sc.fsu.edu/~gerlebacher/two_materials.blend

Simply press “P”

Thanks for any advice on how to achieve different bounces on the different materials. I am using Blender 1.63a on a Mac.

Gordon

2

*** Moderation ***
Moved from other thread as it does not belong to it.
*** End of moderation ***

You are right.
It looks like the Physics engine uses the first material only. I suggest to open a bug at the bugtracker.

3

A simple work around: Just make the cube out of 2 separate objects with different materials. Parent one of them to the other if you need them to move.

4

this is “another” bug (to add to other suspect)
linked to MATERIAL.

(lights in GLSL + faces position + … elasticity)