Sky darkening

#1

Hello all, new paying member here.

Quick question I hope concerning Blender 2.5a2 compositing nodes.

I have a very simple scene where a glowing ball of light travels into the scene, over the camera (which is tracking it) and into the distance.

My node set up (as pictured below) is two render layers.
The base layer contains the scene and the object within the glow, in this case a simple black square, and a green plain object to serve as the ground. The base layer Include settings (pictured) has all options checked except zmask, neg and All Z. Visible layers 1 and 6 are selected. Scene Layers included in the Render is only the 1st.
The glow layer contains just about everything else, being the glow object itself (a copy of the black square given a different material), all lights (two points and a sun), 6 area lights parented to the glow object. The glow layer settings (not pictured) Include are zmask, solid, halo, ztransp, edge, strand. The zmask layers selected are 1 and 6. The Visible Layer selected are layers 1 and 6. Scene layers included in the render is just layer 6.

My problem concerns the actual compositing of the two layers together. When the actual compositing gets done my sky darkens preceptively. I can only think Ive done something wrong in my node set up (which works perfect for the glow effect i want) or that I need to disable sky in the base render layer, create a third RL and enable ONLY sky for that layer and then mix it in to the node set up (or would I use an Alpha over for that?)

Anywho Im trying to get this sorted. Any help on this would be appreciated.

#2

Anybody have any ideas on this?

#3

Hey :slight_smile:
try blenderartists or something, seems to me that there are more traffic overthere when it comes to blender.

Don’t know anything about composite nodes, haven’t had time to look it through more thorough. I have some tutorials saved but don’t think they cover what you asked.

#4

It does sound to me like both of the images have alpha in them (and not just in the foreground). Look carefully at each file, isolating the alpha layer using false-color.

If “the sky is darkening,” and unless everything is darkening (look carefully!), it seems axiomatic that both layers of material include “sky”-related information… most likely redundant.

Ditto the idea that “blenderartists.org” is going to be a lot more fruitful for this one.

#5

I would love to help if i could see the image properly :slight_smile:

#6

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