eddgarpv Posted July 30, 2015 Share Posted July 30, 2015 Hello, I'm trying to use near/far clipping planes on a camera to render a volume and comp something in the middle.. the problem is, when the far clipping plane is in the middle of the volume (i.e. the front part of the fire), the far clipping plane is ignored. If the volume is hidden, I can get the front part clipped. Right section of the image is using the same far clipping plane as the left part, just with a hidden volume. I'm not really sure if I should add something else to the ROP, so any hint is appreciated Here is the indie file and bgeo. thanks! Quote Link to comment Share on other sites More sharing options...
Guest tar Posted July 31, 2015 Share Posted July 31, 2015 If it's a bug please submit to SideFx. Have you tried Deep compositing. It will do what you want, better but with bigger file sizes. Quote Link to comment Share on other sites More sharing options...
eddgarpv Posted August 9, 2015 Author Share Posted August 9, 2015 Submitted to support. I tried using deep comp but for this particular shot, it was too much (of disk space and nuke script setup). I've found that this problem happens when there is no density field in the volume. If I create a primitive called density and copy heat to it, it will clip the volume just fine. http://i.imgur.com/zrODQKX.png I ended up using matte objects for the front, but now I know how to solve it. Quote Link to comment Share on other sites More sharing options...
eddgarpv Posted August 21, 2015 Author Share Posted August 21, 2015 from support: The issue that was causing the incorrect shading was related to ray continuation. Some of the tracking of ray distances was off, resulting in ray continuation beyond the far clipping plane.This issue has been resolved for our Houdini 15 release. Quote Link to comment Share on other sites More sharing options...
jkunz07 Posted August 21, 2015 Share Posted August 21, 2015 Submitted to support. I tried using deep comp but for this particular shot, it was too much (of disk space and nuke script setup). I've found that this problem happens when there is no density field in the volume. If I create a primitive called density and copy heat to it, it will clip the volume just fine. http://i.imgur.com/zrODQKX.png I ended up using matte objects for the front, but now I know how to solve it. Have you tried adding "vm_volumequalitychannel" (http://www.sidefx.com/docs/houdini14.0/props/mantra#vm_volumequalitychannel) property to the geo node and setting it to "heat"? I'm not sure, but it might fix it. Quote Link to comment Share on other sites More sharing options...
eddgarpv Posted August 21, 2015 Author Share Posted August 21, 2015 Have you tried adding "vm_volumequalitychannel" (http://www.sidefx.com/docs/houdini14.0/props/mantra#vm_volumequalitychannel) property to the geo node and setting it to "heat"? I'm not sure, but it might fix it. Ah, that was the problem. Adding that option solves the issue... thanks John! Quote Link to comment Share on other sites More sharing options...
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