I've recently started working with blender. For a project i'm working on i would like to visualize evapotranspiration of a park.

My animation starts with nighttime where dew is created (picture 1) where the trees and grass collect particles with a collision.

Picture 1:

enter image description here

Then during day the trees, grass and water should evaporate particles. But because there is a collision on the trees, the particles will stick to the bottom of the trees... (see red circle picture 2).

Picture 2:

enter image description here

Question: is there a way to change the properties of the collision after a certain frame?


Like many of the values in blender the collision properties can be animated. You can't enable/disable collision entirely but you can change properties such as friction and stickiness so that it is effectively disabled.

Either with the cursor over the value press I or RMB RMB and select Insert Keyframe, then go to another frame, adjust the value and insert another keyframe.

When changing values in an on/off manner it is common to add keyframes on two neighbouring frames. In the graph editor, you will want to change the interpolation type by selecting the keyframes, pressing T and choosing either vector or constant to prevent value variations between frames.

change interpolation

  • $\begingroup$ Thanks for the comment! Didn't think it would work this way.. $\endgroup$ – blueties Jun 22 '16 at 12:07

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.