Emitter issue

Sat Sep 17, 2011 8:38 am

Not sure if this issue has been brought up. I have two emitter materials for a scene. I applied one for some wall lights and used an IES file to setup distribution and was fine. I created a new emitter for other bulbs and the 1st emitter became hugely slow to converge to clean result. It creates the effect where there are random fireflies on the surface from which the light effects.

Sat Sep 17, 2011 8:47 am

The more light sources you add, the slower rendering will be. It's just the way that it has to calculate light coming from 2 places rather than 1.

Sat Sep 17, 2011 9:43 am

That's not the problem I did test with one emitter material on each object (2 in total) and then the previous emitter became almost useless as though the engine had a difficult time sampling the light from the emitter, where as with one emitter on all these objects it would render fine. I may be wrong but this may be an issue with having one emitter with IES file and a standard emitter. Could be a bug.

Sun Sep 18, 2011 11:08 pm

Octane can have problems with light sources that are very small compared to other light sources in the scene. Are your light sources similar in size?

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Roeland

Sun Sep 18, 2011 11:21 pm

One is a bit larger than the other. One of the lights in my scene is attached to a wall surface and is projected down and hitting the surrounding surface. Another light is dangling from a ceiling and the emitting object is bigger than the wall light. Although I noticed this with direct light and the problem also occured in pathtracing which it seemed like it could take a huge amount of time to compute and sample those light areas, with pmc it helped me and did a more efficient job in this case.