Normal pass missing blue channel?

Support Compositing and Post Processing
#1

Hi,

The normal pass out of Blender’s (2.48a) compositor seems to be missing the blue channel. All I get is information on the red and green channels.

Is this a bug or can the blue channel be created from the red and green?

I’ve searched the forums and can’t find a specific answer to this question.

Thanks.

–
Sincerely,
Kevin

#2

what exactly do you mean? from which node? the render layers node does not have an RGB output. I havn’t seen any issues with that, so please post the node in question, and possibly a screenshot.

~sorry I can’t be more helpful.

#3

Hi,

Here is some more detail…

This is the kind of map I need:

http://ww.virtualmatter.org/hosted/map1.jpg

This is what they normally look like in blender (no blue channel):

http://ww.virtualmatter.org/hosted/normals1.jpg

Here are the separate channels, as you can see, no blue:

http://ww.virtualmatter.org/hosted/normals2.jpg

Because blender’s compositor works in float, I had a suspicion that the information was set to a different range… I was right:

http://ww.virtualmatter.org/hosted/normals3.jpg

The only problem now is that the x and y channels each need to be inverted for what I need (I need the red on the right, and the green on the top). I have no idea how to do this.

I also don’t know why the values were not normalized to start with, but there might be a good reason for that.

Any help with these new issues would be great. Thanks.

–
Kevin

#4

Figured out how to fix this issue using the compositing nodes.

Article and Blend file are availabe here:

http://twentyfourbecks.wordpress.com/

Hope this can help you out :wink: