"Hot Pixels" on Shadow Pass / Live Viewer auto re-renders
Posted: Wed Feb 08, 2017 4:34 pm
Hey guys,
I have a couple questions, but i'll present the main one first.
Question #1
I have a very large scene that I am trying to render some elements out of for compositing. Right now the scene is lit with a single HDRI, and there are several (clones of the same) objects standing upright on a ground plane. I'm trying to render out the beauty pass of the main objects, and use the ground plane as a shadow catcher.
So I have an object tag on my ground plane, and it is set to layer 2. My main objects are tagged with layer 1, which is the visible layer. Shadows and Black shadows passes are enabled. The beauty pass (and a test pass that includes a visible ground plane) both render out completely fine, but the shadow passes by themselves have what I would describe as black "hot pixels" around the edges of the objects.
(note: I know the shadows are very dim/diffuse, but the scene is a very early morning shot with the sun just starting to rise)
These hot pixels are very visible when recomposited. Again, if I render out the whole scene with the ground plane enabled, then there are no "shadow hot pixels" around the edges.
Any ideas on this? Rendering with Pathtracing.
Question 2
Somewhere along the way, my live viewer began automatically rerendering the current frame even though I made no changes to the scene. Sometimes it doesn't even finish the render before rendering again, and doing something like moving my cursor over the live viewer will trigger the rerender. Is there a setting somewhere I may have bumped that is causing this to happen? Only other thing I can think of is I updated to 3.05.3 recently and don't remember this happening before that point.
Thanks for your help guys, sorry for all the questions!
I have a couple questions, but i'll present the main one first.
Question #1
I have a very large scene that I am trying to render some elements out of for compositing. Right now the scene is lit with a single HDRI, and there are several (clones of the same) objects standing upright on a ground plane. I'm trying to render out the beauty pass of the main objects, and use the ground plane as a shadow catcher.
So I have an object tag on my ground plane, and it is set to layer 2. My main objects are tagged with layer 1, which is the visible layer. Shadows and Black shadows passes are enabled. The beauty pass (and a test pass that includes a visible ground plane) both render out completely fine, but the shadow passes by themselves have what I would describe as black "hot pixels" around the edges of the objects.
These hot pixels are very visible when recomposited. Again, if I render out the whole scene with the ground plane enabled, then there are no "shadow hot pixels" around the edges.
Any ideas on this? Rendering with Pathtracing.
Question 2
Somewhere along the way, my live viewer began automatically rerendering the current frame even though I made no changes to the scene. Sometimes it doesn't even finish the render before rendering again, and doing something like moving my cursor over the live viewer will trigger the rerender. Is there a setting somewhere I may have bumped that is causing this to happen? Only other thing I can think of is I updated to 3.05.3 recently and don't remember this happening before that point.
Thanks for your help guys, sorry for all the questions!
