TomRaynor Posted September 11, 2013 Share Posted September 11, 2013 I am trying to make point (particles) illuminate a volume using the geometry light. Does the geometry light work with points. I can get a small sphere to illuminate my volume using the geometry light but if I try and do it with a single point, it doesn't work. Simple scene attached for reference. Thanks. geometryLightTest_v01.hip Quote Link to comment Share on other sites More sharing options...
JonathanGranskg Posted September 11, 2013 Share Posted September 11, 2013 I'm getting a fatal error when trying to open your scene, but I created a scene of my own. It's pretty simple, you can see the random point colors affecting the light when you render. GeometryLightPoints.hipnc Quote Link to comment Share on other sites More sharing options...
TomRaynor Posted September 11, 2013 Author Share Posted September 11, 2013 I am wondering if what you were seeing there was reflection or something. You had no material assigned to your ground plane, so I first tried a clay material assigned to the ground and then a mantra surface shader with reflectivity turned off. I can't see any diffuse illumination on the ground at all... I also put a volume in there with a billowy smoke shader and it seems to be getting no illumination either. Ideas? GeometryLightPoints_v02.hipnc Quote Link to comment Share on other sites More sharing options...
Dispel Posted September 12, 2013 Share Posted September 12, 2013 Not sure if this is what you need, but I had a hip file with a particle system emitting geometry lights (essentially), let me know if you need to see that so I can dig it up. Quote Link to comment Share on other sites More sharing options...
TomRaynor Posted September 12, 2013 Author Share Posted September 12, 2013 I take it it is not just a case of plugging the path to the geometry with the particle system into the geometry light? I would love to see the scene if you wouldn't mind digging it up! Thanks. Quote Link to comment Share on other sites More sharing options...
JonathanGranskg Posted September 12, 2013 Share Posted September 12, 2013 (edited) I am wondering if what you were seeing there was reflection or something. You had no material assigned to your ground plane, so I first tried a clay material assigned to the ground and then a mantra surface shader with reflectivity turned off. I can't see any diffuse illumination on the ground at all... I also put a volume in there with a billowy smoke shader and it seems to be getting no illumination either. Ideas? Oh sorry, my bad. I had accidentally turned off diffuse contribution on the light. Not sure how I managed, but turning it on again will fix it. Edited September 12, 2013 by JonathanGranskg Quote Link to comment Share on other sites More sharing options...
TomRaynor Posted September 12, 2013 Author Share Posted September 12, 2013 Ok, I have no idea, what I was doing before, possibly had diffuse off, but it is now working. Very sorry about that. Quote Link to comment Share on other sites More sharing options...
TomRaynor Posted September 12, 2013 Author Share Posted September 12, 2013 Ok I now see what the difference it between it now working and previously not working. Apparently you need to have a particle system in there for the geometry light to pick up the points as lights. If I kill out the particle system so the geometry that the geo light uses just has isolated points, it doesn't seem produce any light... At least it is now working! Quote Link to comment Share on other sites More sharing options...
JonathanGranskg Posted September 12, 2013 Share Posted September 12, 2013 (edited) Ok, I have no idea, what I was doing before, possibly had diffuse off, but it is now working. Very sorry about that. I highly doubt it was your fault. Diffuse contribution was off in the file I posted too, so no worries. Edited September 12, 2013 by JonathanGranskg Quote Link to comment Share on other sites More sharing options...
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