Questions tagged [render-passes]

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17
votes
1answer
6k views

Can someone explain the layer system?

I am really confused with the different uses of the terms "Layers" and "Passes" in Blender. Can someone please explain how they work in Blender. I know about Render Passes like AO, Diffuse and so on, ...
8
votes
1answer
1k views

Correctly re-combine ALL render passes?

So, there are some great tutorials around the web about isolating render passes in Cycles so that you can make changes, and then recombine all of your work as one complete image. You'll probably have ...
8
votes
1answer
908 views

What causes this mist pass glitch?

The problem, and what I've tried so far From the screen shot you can see that sky-blue from the mist color is leaking through the trees due to white spots that are occurring in the mist pass on the ...
7
votes
1answer
634 views

How can I render Volume Scattering on all my layers?

I have an interior scene in witch I want to have atmospheric falloff (dust effect). I've created an object that contains my room and I gave it a volume scatter shader (I'm working in Cycles). The ...
6
votes
1answer
480 views

Is Z-Render Pass accuracy dependent on sample count? Are others like object id? (Cycles)

So I have a single-frame project and want to send it to a renderfarm that does not support OpenEXR or compositing (SheepIt). Can I simply do a 1 sample pass on my computer and still get high accuracy ...
6
votes
1answer
258 views

Why do different render engines generate different z pass?

I've been using Blender to generate depth maps using z pass. I notice that the z pass generated by different render engines are different, which made me a bit confused. My feeling is that the z pass ...
6
votes
1answer
503 views

How do render passes work?

I got a lot of related questions about render passes in Cycles lingering for a while now and apparently I can't figure it out myself. When it comes to render passes, this manual page with the image ...
6
votes
1answer
979 views

Cycle Normal Pass in Camera Space

I am wondering if there is any way that we can alter the cycle normal pass to output value in camera space. Currently, as far as I know, the normal is in object/world space, which does not change when ...
5
votes
2answers
389 views

A good way to render objects on a photo background that works also with focus-blurred margins

I'm trying to render with Cycles on a photo background using Blender Guru's compositor nodes: [ Here, the foreground objects are obId=1 and are on layer 1 (rendered in RenderLayer); reconstructed ...
5
votes
1answer
957 views

Vector Blur Node not blurring

I have a bunch of boxes flying apart in Cycles, and I'm using the Vector Blur node for motion blur. Nothing's blurring. It's the simplest compositor setup: RenderLayer Image/Z/Speed goes to Vector ...
5
votes
2answers
313 views

UV render pass non-linearity

I am writing a piece of software that needs pre-rendered UV maps for on the fly texture mapping. I tried rendering these maps in blender, but the color values in the resulting image do not change in a ...
5
votes
1answer
1k views

How to do a lightcast only Layer in Cycles?

I try to render a layer that only includes the light as if it was cast onto an object. But it seams it is not possible to make a material that is invisible for the camera but bounces light from a ...
5
votes
1answer
1k views

Accurate IndexOB and IndexMA passes

I'm trying to get an accurate index pass for compositing. My geometry (a window in this case) consists of straight lines and it would be nice to have a perfect mask for color correction. As you can ...
4
votes
1answer
2k views

Understand color of Diffuse Direct/Indirect pass in Cycles render

The Blender manual page says about Diffuse direct and indirect as follows: Diffuse Direct Direct lighting from diffuse BSDFs. We define direct lighting as coming from lamps, emitting surfaces, the ...
4
votes
3answers
6k views

How to output ID masks as seperate files for compositing?

When I click 'Render' or hit F12 and select IndexOB pass in the viewer I'm able to see a mask (white on black) as expected, but when I click 'Animation' to output a series of these masks as '.png' ...
4
votes
1answer
110 views

Rendering World Position Pass

I need to render a world position pass in Blender to check if my idea is correct. I found solution that uses an emissive material and geometry node to render position as colors: How to render world ...
4
votes
2answers
350 views

Difference between Shadow pass and Diffuse Direct?

What are the differences between the compositor's Shadow Pass and Diffuse Direct Passes in Cycles? I know one is that the Shadow Pass only responds to lamps and not mesh emitters. But even on renders ...
4
votes
1answer
126 views

To what degree does Cycles' sample level impact other passes?

Can equally useful AO, Z, mist, speed and other non-beauty passes be generated at lower sample rates compared to those rates needed for beauty passes? How about ObjectID mask passes?
4
votes
1answer
377 views

How to use the new render pass API for an external renderer?

I am developing an addon for an external renderer and want to register custom render passes. Last time I implemented this feature I had to resort to images because Blender only had hardcoded render ...
4
votes
1answer
600 views

Blender 2.77 Motion Vectors

I am new to Blender and trying to render out motion vectors on animated objects. I animated a cube and did what I thought was correct and it rendered nothing. See video: http://www.knottypixel.com/...
4
votes
0answers
57 views

split up and render depth slices (for extreme dof)

I'm doing a particle simulation of fire embers swirling around, to be matched up to a filmed plate. The plate has a very shallow depth of field, which creates a problem when comping it in. It takes ...
3
votes
1answer
10k views

Z depth pass in Cycles, rendering white [duplicate]

Using Cycles as a render engine, I assigned an empty as a camera Track To target, and as the focus target in Depth of Field, yet rendering the scene, the depth pass is rendering all white, as if there'...
3
votes
1answer
1k views

Difference between a mist pass and a normalized z-buffer?

In Cycles there are two different render passes which seem to give some kind of depth information: the Mist pass and the Z-Buffer pass. I know that the z-buffer gives the actual distance (thus ...
3
votes
1answer
460 views

Render Passes separately

Is there anyway to render passes other than combined separately ? I would like to render the Z pass, the mist or the normal pass separately but even if I disable the Combined pass, blender still ...
3
votes
1answer
110 views

Is there a way to utilize emissions in VFX?

everyone. I have a piece of footage that I have motion-tracked fairly successfully, solved the camera motion, and made it into a 3D scene with that little button on the left of the motion-tracking ...
3
votes
1answer
400 views

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

I am making renders for research in computer vision, and need to know the CIE color space values from each render. Right now I am rendering a few different passes to an EXR Multilayer file. I ...
3
votes
1answer
164 views

Render pass that output center of object of each pixel

I am looking to create a render pass that takes a scene and outputs, for each pixel, the 3D world coordinate of the center of the object to which that pixel belongs. In other words, all pixels that ...
3
votes
2answers
277 views

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

Using the compositor node setup above, when I hit F12, it makes a new pass and the rendered images are automatically saved. The problem is that the new render erases the previous one that was saved in ...
3
votes
1answer
333 views

Make Mist pass skip semitransparent objects

I am having problems with the Mist pass. I have search other questions but didn't find the answer. As you can see, I got an ocean (left) and a "river" (right). Don`t mind about the river disappearing ...
3
votes
1answer
259 views

Cycles: Export each light into separate files

Sorry in advance if this has been answered. Is there a way to set each of my 3 lights (key, fill, rim) up in such a way that Blender will render them all individually? I have looked into File output ...
3
votes
0answers
786 views

I can't find the pass with foam

I render a scene in Multilayer EXR sequence (Cycles). After I've combined the passes together everything is OK, but there the foam is missing. I've checked all the passes, and I don't see pass with ...
2
votes
2answers
127 views

Blender depth mystery

I am trying to use the depth values from a render. I created the appropriate graph that directly connects the render layers depth pin to an OpenEXR file output. The problem is that the depth values ...
2
votes
2answers
2k views

How to achieve a flat colored render pass from material id/index for masking

I'm trying to get a render pass that splits all different materials into flat shaded objects (like material id in 3ds max) with anti aliasing. The output colors aren't important. (random colors are ...
2
votes
2answers
3k views

Compositor ID Mask not working?

I want to give my model a glare effect at robots eye, so I gave the material assigned to the eye Pass Index of 1 then when I went to compositor and made this node set up, in the viewer I could ...
2
votes
1answer
6k views

Volume Scatter in World makes the sky turn black [duplicate]

While using the "Volume Scatter" option in Blender the Background turns Black. (I am using Blender 2.79). Here is my issue in detail. The first image below shows a normal scene with Blue sky (Set ...
2
votes
1answer
155 views

Cryptomatte doesnt output nice clean edges

Is there any way i can have cleaner edges out of the cryptomatte image output ? The outline is just not clean enough.
2
votes
1answer
2k views

Fastest way to export files multiple passes into folders?

What is the fastest way to export the files of multiple passes into a folder for the appropriate pass in Cycles? Is there any way to automate this process? For example, if you wanted to render: ...
2
votes
2answers
217 views

How does the cycles render-passes (for example: diffuse) works out when using colored light source?

As i read in the blender-wiki, there are several render-passes which are added/multiplied later on in order to give the final image. My question is, How does colored light influences the values of ...
2
votes
1answer
278 views

Get Object/Material Index of Completely Transparent Objects

OK, I know the question is kinda usual. My problem is I want some objects in a scene completely transparent/invisible (in most of the render passes) while I still can show it in either material or ...
2
votes
1answer
643 views

Rendering Environment pass without Combined pass in Cycles

Using Cycles,I have a scene with Volume Scatter shader connected to World Background and an HDR image connected to the surface, Rendering the scene while checking Environment pass is giving me a nice ...
2
votes
1answer
965 views

How to do seperate render passes in blender?

I a lot of VFX breakdown that uses something they call "render passes". From what I see, they are rendering the clip in seperate ways (like rendering the ambient occlusion, specular, shadows, depth of ...
2
votes
1answer
437 views

Blender render passes

If you set up render layers in blender and you have them all ticked wouldn't blender render all of those layer for you all at once one after the other with all the associated maps that have been ...
2
votes
1answer
55 views

Transferring colors from my Direct/Indirect passes into Color

I'm doing some compositor effects on my Cycles passes before outputting them to Krita and recombining them. But I'm running into a problem: Cycles stores a bunch of indirect light color in the Direct ...
2
votes
2answers
916 views

Depth in meters for rendered images

How can I get the depth in meters? I need the "real" distance from the camera to each pixel. As the next picture but each pixel values representing the distance in meters to the camera. I am ...
2
votes
2answers
175 views

Accessing Vector Pass Data in python in background mode

Background: We are building an automated pipeline to extract motion (i.e. vector pass output) from animated blends by running scripts using blender's python API. We are able to programmatically set up ...
2
votes
1answer
208 views

How to properly combine Z passes using multiple .EXR files?

I'm having trouble combining openEXRs (rendered with subframes on multiple nodes) containing Z passes in the compositor. Whenever I run 1 subframe into the normalize node I get the correct output. ...
2
votes
1answer
31 views

Freestyle lines as an independent render pass

In 2.7x series I could select Freestyle lines into its own render pass. In 2.80RC2 I cannot find such an option. Is it not implemented yet or I am missing it?
2
votes
1answer
157 views

Select pass mode via python script

I want to change the value of "Pass" type inside the "UV/Image Editor" area as shown on image. The default "Pass" value is "Combined" and I want to change the value to other available types with ...
2
votes
1answer
317 views

How to render a night scene [duplicate]

I really need some help regarding rendering a night scene. When i tick the denoising option. My render become ugly where there is a black dirt on the image. As in the image below. And if i untick ...
2
votes
1answer
486 views

How to get glare on a specific emission reflection

I am attempting to make a red dot sight that is (relatively) physically-correct, but I would like to add a bloom/glare effect to the red dot. Basically, a face that emits red light reflects off a ...