21 votes
Accepted

Can someone explain the layer system?

Layers Layers are a way of splitting up and organizing the objects in your scene. In the 3D viewport. You can select the currently visible layers in the footer of the 3D view or under properties ...
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  • 24.3k
17 votes
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Z depth pass in Cycles, rendering white

No, you're not doing anything wrong. The Z-Pass is one of just a few, when not even the only pass that doesn't have a range from 0 to 1. It goes from almost Zero to infinity. Every pixels gets ...
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14 votes
Accepted

Correctly re-combine ALL render passes?

SSS works just like the 3 other "light type" sets do, so you add SSS direct and SSS indirect, multiply the result by SSS color, and sum that result with the other sets. Shadow is not an image ...
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  • 8,887
11 votes
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Is there a way to utilize emissions in VFX?

A method to get believable light interaction with the environment, is to recreate the environment. I have chosen this template image. The process will be the same for moving, tracked footage, but the ...
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  • 24.5k
10 votes

Cryptomatte doesnt output nice clean edges

I assume your screenshot shows what you would see in the image editor if you have rendered cryptomatte passes, and view them directly. In that case, they look absolutely horrible: However, that's not ...
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  • 10.4k
9 votes
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What causes this mist pass glitch?

Multiple transparent planes with low Max Transparecy Bounces The "Tree1" object is made by multiple overlapping planes. Their shading properties comes out from a sharp Mix of a Transparent shader and ...
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  • 24k
9 votes
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How to properly connect the Denoise node in Compositor?

When in doubt, use the Image pass. Image provides unmodified render result output also comes denoised by the Internal denoiser if it's enabled Noisy Image provides a Despeckled image (useful when ...
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8 votes

How to output ID masks as seperate files for compositing?

Object ID passes Assign a unique 'Pass Index' value to each object Enable Object Index pass (Properties > Render Layers > Passes > Object Index) Create a 'File Output' node in the compositor via Add >...
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  • 14.6k
8 votes
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How to achieve a flat colored render pass from material id/index for masking

You ask a question to which there is no simple answer based on your requirements: no python - this limits any automation and implies a lot of work with anti aliasing - this is something cycles cannot ...
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7 votes
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Fastest way to export files multiple passes into folders?

The File Output Node is exactly what you are looking for. Unfortunately the documentation does not mention how to get it to output to different subfolders, but thanks to sambler you can have each file ...
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  • 47.6k
7 votes
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Render Passes separately

The Combined pass is useless in Cycles as far as I know, it doesn't change anything if it is enabled or not. In Blender Internal you can exclude from this pass other passes (like Shadow pass etc.) ...
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7 votes

How do I stop the Compositor Output Node from overwriting my images on each new render?

Thinking ahead, you want the Output Path in sync with all the File Output Nodes of the compositor. I think one easy way to solve this is adding a 'version number' to all output paths (as usual) and ...
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  • 14.6k
6 votes
Accepted

Vector Blur Node not blurring

This is because the vector pass can't "see" through transparent (glass) objects; in this case all it sees is the lens object, which is remaining motionless relative ...
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  • 152k
6 votes

Understand color of Diffuse Direct/Indirect pass in Cycles render

I'll try to explain. Here is an example. We have an orange ball on the gray plane, lit from the side. What contains the Diffuse Direct pass? A reflection of light coming from the lamp on the side. As ...
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  • 22.9k
5 votes
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How to do seperate render passes in blender?

Actually, your question is a little bit vague, you have everything you need to begin to understand this topic on the Blender Reference Manual Short answer, because this is a huge topic, and your ...
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  • 489
5 votes
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Is Z-Render Pass accuracy dependent on sample count? Are others like object id? (Cycles)

No, Z pass, ObjectID and alike are not dependent on Cycles render samples. Their visual output will always be the same like rendered with 1 sample - so not nice. It's better to obtain them in Cycles ...
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5 votes
Accepted

Z depth values in OpenEXR do not match the objects in the scene

Blender's depth map should work fine. I have tested it and I do get the right distance. How do you load the OpenEXR files? Not all OpenEXR readers are reliable. I have noticed that OpenCV can give ...
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  • 66
5 votes
Accepted

Some pixels doesn't render on the image ID MASK

Don't use ID Masks Just don't. They have little use, this is a really poorly designed feature. You simply cannot make a good mask with a 2bit color depth image. Cryptomatte is the solution Look into ...
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5 votes
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Cryptomatte - Clean edges

It looks like you are trying to use Pick image output as is. This answer explains why you are not supposed to use Pick image output. In short, it is intended only for picking the values, and it is not ...
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5 votes

How create perfect mask using ID Pass ( "clown pass" in Photoshop)?

Workbench It is not that easy :) and in some cases just impossible. If you want to just make parts darker or brighter, there is a change you just dont notice, but it would be there. This "...
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  • 27.4k
4 votes

Show sample rate pass on Yafaray

I've released YafaRay-E (experimental) v2.0.0, which includes Render Passes, Render Views and, among other things, there is a samplerate pass available that shows the places where the adaptative AA is ...
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4 votes
Accepted

Render pass that output center of object of each pixel

You can do this by using a Material Override and a special material to give the objects' positions. First create a new material with an emission shader (you can add it to any object, it doesn't ...
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  • 24.3k
4 votes

How can I render Volume Scattering on all my layers?

You should use the render layers mask feature. First divide up your solid objects between render layers however you would like. Then, place your volume object on its own separate layer. With the ...
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  • 1,620
4 votes
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A good way to render objects on a photo background that works also with focus-blurred margins

As 3dpointedit pointed out, there is a limitation of the current ID mask system: Is Z-Render Pass accuracy dependent on sample count? Are others like object id? (Cycles) As such, these layers are ...
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4 votes
Accepted

Convert an EXR render from scene-linear colorspace to CIE XYZ

It isn't straightforwards as Cegaton notes. You could abuse Blender's ridiculous OCIO integration to achieve this however. Save the file as an EXR, and add the following stanza to the OpenColorIO ...
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  • 12.1k
4 votes
Accepted

Set Mist Pass Distance

The "Mist Pass" is the properites windows under the world tab.
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