2009

Collision Test
Particle View on page 2811 > Click Collision in an event or add Collision to the
particle system and then select it.
Collision tests for particles that collide with one or more specified Deflector
space warps. It can also test whether a particle has slowed down or sped up
after one or more collisions, has collided more than once, and even whether
it will collide with a deflector in a specified number of frames.
The Collision test supports all deflector space warps except the DynaFlect
deflectors:
■
POmniFlect on page 2732
■ SOmniFlect on page 2743
■ UOmniFlect on page 2746
■ SDeflector on page 2751
■ UDeflector on page 2754
■ Deflector on page 2757
TIP When testing for collisions with multiple deflectors, for best results, place all
the deflectors in a single Collision test. This tests for collisions with all the deflectors
simultaneously, and helps avoid possible missed collisions.
See also:
■
Collision Spawn Test on page 2964
Procedures
Example: To test for particles slowing down after one or more collisions:
In the real world, particles bouncing repeatedly against a surface lose kinetic
energy at each collision, and slow down gradually. Rather than testing for a
specific number of bounces, you can use the Is Slow After Collision(s) to test
whether particle speed has sunk below a specific level.
1 Start or reset 3ds Max. Set the animation length to 500 frames.
2960 | Chapter 14 Space Warps and Particle Systems