STN
10-23-2008, 04:36 AM
Hi, I'm going through all the nodes in the ICE Nodes training and stumbled upon an inconsistency that got me scratching my head for a while before figuring it out.
In the negate node video the trainer (sorry, forgot your name :) ) says we are going to create a gravity based upon the particle's mass, so that smaller particles fall slower than particles with a heavy mass. The thing is, it doesn't happen, they all accelerate at a uniform speed.
This happens because a larger mass (weight in kg) needs more force (in y) to pull it down. If the force is equal to the particle mass the velocity of all particles will be the same. So in the ICE tree that we create in the negate video the explanation is not matching the outcome in the viewport.
I managed to achieve the effect described in the video the following way:
http://stansmulders.com/uploads/xsi/gravity_negate.jpg
Hopefully this helps you!
In the negate node video the trainer (sorry, forgot your name :) ) says we are going to create a gravity based upon the particle's mass, so that smaller particles fall slower than particles with a heavy mass. The thing is, it doesn't happen, they all accelerate at a uniform speed.
This happens because a larger mass (weight in kg) needs more force (in y) to pull it down. If the force is equal to the particle mass the velocity of all particles will be the same. So in the ICE tree that we create in the negate video the explanation is not matching the outcome in the viewport.
I managed to achieve the effect described in the video the following way:
http://stansmulders.com/uploads/xsi/gravity_negate.jpg
Hopefully this helps you!