Pond : creating particle rain effect

[bernard397]

Hello,

I want the particles to collide with my pond water surface. How can I create wakes where my particles collide.
I know how to do this with an ocean, but not with a pond fluids effect.

Thanks

Bernard

[duncanbrinsmead]

Create a pond surface locator and examine the resulting expression. Compare that with an ocean surface locator. The difference would be the same difference as between your ocean particle expression and one for ponds.

Duncan

[bernard397]

Hello Duncan, thx for the quick reply. If I want to create wakes do I also have to use setFluidAttr (like oceans) or is there another method?
I have studied the Ocean and Pond surface locator expressions and saw that the main difference is the colorAtPoint and fluidValueAtPoint...

Thanks

[duncanbrinsmead]

If you want to intersect particles you need to use setFluidAttr. For objects you can simply use the object as a fluid emitter( or use any of the the fluid emitter methods ).

The fluidValueAtPoint gets the height of the fluid(y) at the particle xz location. With that you can determine if the particle is underwater by checking if the particle y is less than this value. If so, then you emit into the fluid using setFluidAttr. Fluid voxel info can be used to find the fluid voxel at the particle location.

Duncan

[bernard397]

Hello ,

many thanks for the great tips! I've got another question:
Which is the best method to make a water splash in a pond or ocean?

Bernard

[duncanbrinsmead]

In general the ocean method is better.. the pond uses a direct volume render of a fluid while the ocean uses textured displacement on a plane. One can't, for example, raytrace reflections/refractions on the pond.
Also particle render integration is easier with the ocean.

 Duncan