pld Posted September 19, 2005 Share Posted September 19, 2005 Hi All, i'm very new to Houdini (couple of weeks) and experimenting with particles. I am trying to have particles slide (or bounce) when they collide with a surface which acts as a slide. I think that I set up the network correctly however 10% or so of the particles go through the colliding geometry as if no geometry was there!?! I assume that is something to do with how often Houdini is computing the simulation... Is there a way to solve this issue? this is my POP net: Source (use a grid as geometry source) - force - drag - collision (use second geometry source) Many thanks! Quote Link to comment Share on other sites More sharing options...
Jason Posted September 19, 2005 Share Posted September 19, 2005 Hi there, There have recently been reports and bug-fixes for particle sliding. Only in the very recent versions of Houdini 8 hass this been fixed. Try downloading today's version of Houdini 8 and try again. Write back here or on Side Effects' forum if you continue to have troubles with it. Good luck, Jason Quote Link to comment Share on other sites More sharing options...
pld Posted September 19, 2005 Author Share Posted September 19, 2005 Hi there,There have recently been reports and bug-fixes for particle sliding. Only in the very recent versions of Houdini 8 hass this been fixed. Try downloading today's version of Houdini 8 and try again. Write back here or on Side Effects' forum if you continue to have troubles with it. Good luck, Jason 21376[/snapback] Hi Jason, thanks for the reply. I'm actually testing this with Houdini 6.1 and 7. I did try with 8 last week and noticed that particle sliding wasn't working at all. In my case the problem is different. The sliding is working nicely, however every second or so I see a few particles that ignore the colliding geometry... Any ideas? I tried to increase the value of Ovesampling on the Popnet to 5 but still no joy patrick Quote Link to comment Share on other sites More sharing options...
Lukich Posted September 19, 2005 Share Posted September 19, 2005 try and slightly crank up the collision tolerance on a collide pop. i noticed it sometimes fixes problems with sliding. Quote Link to comment Share on other sites More sharing options...
stevenong Posted September 19, 2005 Share Posted September 19, 2005 Hi patrick, In the Collision POP, set the "Hint" geometry type from "Static Geometry" to "Deforming Geometry (Only Triangles)". This option is only available from Houdini 7.0 & up. To convert the collision geometry to triangles, you can use a Divide SOP. As for Oversampling, you want to set the Oversampling parameter of the Collision POP instead of the popnet. There is a difference to them. Else, please post your hip file so we can take a look at it. Cheers! steven Quote Link to comment Share on other sites More sharing options...
pld Posted September 20, 2005 Author Share Posted September 20, 2005 thanks for your help..both of your suggestions helped a lot! cheers patrick Quote Link to comment Share on other sites More sharing options...
Bernard Posted September 20, 2005 Share Posted September 20, 2005 Hi patrick,In the Collision POP, set the "Hint" geometry type from "Static Geometry" to "Deforming Geometry (Only Triangles)". This option is only available from Houdini 7.0 & up. To convert the collision geometry to triangles, you can use a Divide SOP. As for Oversampling, you want to set the Oversampling parameter of the Collision POP instead of the popnet. There is a difference to them. Else, please post your hip file so we can take a look at it. Cheers! steven 21380[/snapback] Hello, How can I set the Oversampling parameter on a Collision POP? It's not highlighted. (just greyed-out...) Many thanks, bernard Quote Link to comment Share on other sites More sharing options...
stevenong Posted September 20, 2005 Share Posted September 20, 2005 Hi Bernard, If the Hint geometry is set to "Translating Geometry", Oversampling will be turned on. For the other types of Hint geometry, use Bounce Accuracy instead. Cheers! steven Quote Link to comment Share on other sites More sharing options...
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