saving render time
 

I have been told if a scene has a lot of hypervoxels, it is quicker to render the HV seperately and then composite it back in the scene, what is the easiest way to do that.

Thanks

Its kind of odd replaying to my own post, but through a little trial and error I figured it out, so this is case anyone else comes up with the same problem. First of all this only works if you don’t need the hypervoxel to receive shadows, like a very wispy smoke, and it does same overall rendering time. I first render the scene without ray tracing, saving separate color and alpha single images, 24 bitmap worked fine. However every object in the scene, excepted for the HVs, has to be set to constant black in the object render tap, in the alpha channel setting. This just leave the HVs in the alpha images, then I re-rendered the scene with ray traced on and all the HVs turn off in the hypervoxel panel or they can just be taken out of the scene. I then loaded the color and alpha image sequence and set the color image to foreground image and the alpha to foreground alpha, making sure the "use foreground alpha" check box is checked. Just make sure all start frames are synchronized. And it worked fine; it did save a lot of rendering time. But like I said this only works if you don’t need the HVs ray traced.