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Spray(whitewater) collision

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Hi,
I tried River simulation.
Simulated river body is no problem.
but whitewater spray particles are leaking from ground geometry.
(foam and bubble particles are no problem.)

Whitewater sim(DOP) made with shelf tool,
I have added static object geometry(volume) into whitewater simulation.

why spray can not collided?
DOP substeps 1 or 15 or higher,can not solve this problem.

thanks.

Houdini 15.0.459

Windows7

River_Sim_v003-006_WhitewaterView.png

River_Sim_v003-006_WhitewaterDOP.png

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the inputs of your "merge1" node are in the wrong order.

Edited by bunker

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You may ask How did bunker figure that out  ? with experience of course. :)

But if you are new to Dops best place to look for this info is details view. 
Important thing to remember is that Merge node in dops doesn't merge multiple data streams in Sops sense but it creates relationships. 
Relationship data is the one that tells dops dynamic engine which object affect which other object.

Affector Matrix(Table) in dops Details view is very useful in figuring that out.

dops_relationship.jpg


Top row is of Affector objects and left col is Affected objects.
Green color is two way, Blue is one,  and grey no color means no relationship. If you hove rover cells you get the popup text.

Play around with different Affector relationship types on Merge node to see how it reflects in this table.

Cheers ! 

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or simply click on the merge node, the default is set to:
Affector Relationship: Left Inputs Affects Right Inputs

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thanks,
I'm new to DOP and houdini.
I understood rerationship and input-order.

Houdini shows me the status of deta very well.
few particle are leaking, but they are made more better with higher substeps.
 

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