Questions tagged [compositor]

Questions pertaining to Blenders internal image compositor. The compositor is used for manipulating the final result after rendering.

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7
votes
2answers
4k views

How do I get the Glare node to output transparent instead of Black background

This is what I have so far: http://imgur.com/a/ZnFOt The rendered image has a transparent background, but the glare filter creates an output with a black background, so after merging the two ...
20
votes
3answers
22k views

Save all render passes to a single EXR image

I am having an issue with EXR file export that I did not encounter in previous versions of Blender. I used to be able to render a render layer with all its passes and get all the passes included with ...
26
votes
3answers
13k views

Cycles: Shadeless “Shadow-catcher” Material for Rendering onto Footage

I am superimposing CGI over video footage, and have run into a problem in making materials for objects that act as 'shadow catchers'. Essentially I want a shader that is shadeless—like an emitter—but ...
2
votes
2answers
1k views

My objects are semi-transparent, and not one behind the other in the compositor

I have multiple scenes each with different objects. I want to combine all these scenes in the compositor but when they render, all the objects from each scene overlap each other and are all ...
23
votes
1answer
3k views

What is the the ASC-CDL node?

The color balance node in the compositor can be switched to use the ASC CDL How is it used? How is this different from Lift/Gamma/Gain? How do the Offset, Power, Slope options affect the image?
22
votes
3answers
24k views

How can I get a Depth of field render pass?

How can one make a render pass with black and white data to display depth of field based on the Settings > Camera dof settings? I want to blur or defocus in the compositor, similar to the way it is ...
15
votes
2answers
2k views

Make the flame of a candle more yellow

Here is what I have so far: The issue is The candle looks like a light bulb... when I tried to make it more yellow via RGB Curves the whole thing got more yellow: Can anyone help me out? Thanks!
9
votes
4answers
4k views

Glow effect invisible on transparent background

I'm trying to render a lightsaber on a transparent background to use as game sprites. I've followed a tutorial on youtube to create the glow/blur effect and it worked great on a black background but ...
7
votes
1answer
2k views

One part of the render layer glowing?

Take a look at this pic. I want only the eyes to glow without the armor glowing too (The armor got a glossy shader). How can I do that?
20
votes
2answers
8k views

Post-processing Lightsabers in Blender

I've been studying JamesVillanueva's lightsabers for a while now, and have tried to recreate the effects in Blender. The trouble I'm having is with the blade in the compositor. Keep in mind that I'm ...
11
votes
2answers
11k views

Can I make a custom node from a group and have that available in other projects?

I've found some neat combinations of nodes to create certain effects, so I'd like to make them a group and then have that node available on my list of available nodes, even when I reload the startup ...
18
votes
2answers
10k views

How can I resize/move the “canvas” of an image in the compositor?

As you can see, if I try to translate an image in the compositor, it does not affect the actual bounds of the image, only the pixels themselves. The same thing happens when trying to scale an image: ...
8
votes
1answer
20k views

How can I make an object invisible when I render in Cycles?

Using the Cycles Render Engine How can I make an object invisible when I render?
14
votes
1answer
15k views

Using scenes and render layers to composite an object isolated on white background with shadow

I composite 3 individually rendered and saved files to achieve the look of an object isolated on white with a proper shadow: image file of object floating with alpha background image file of a render ...
7
votes
1answer
2k views

How do I overlay a photo of a face over a character on a video?

I downloaded an 80s cartoon intro (Jem and the Holograms; traditional cel animation) and I want to animate cutout photos of various family members' faces overtop the cartoon faces. Bonus points if I ...
1
vote
1answer
379 views

Add object and shadow over a background using the compositor [duplicate]

I am doing an animation with a camera to add 3D elements to it (don't really know what it is called) As you can see in the picture above, i am trying to use nodes to assemble my shadow, object and ...
12
votes
2answers
3k views

Stacking cycles renders in the compositor?

There's a blog post going around about a plugin that uses ImageMagick to stack Cycles renders together. Why can't we do this in the compositor, and with a still frame? Is there a way to "get ahold ...
11
votes
3answers
10k views

Is there a way to save composite node presets?

Is there any way in Blender to save settings in your compositing node setup. For example say for my shadow catcher I have it setup for a hard shadow for sunlight, and then I also have a setting for ...
12
votes
3answers
6k views

How can I make a “Movie Clip” node start at a certain frame of the scene?

When I use "Movie Clip" node in Blender 2.7, it always starts at Scene Frame 1. How can I change it in order to make it start at Frame 6, for instance? The movie clip I am using is a Movie FX for ...
7
votes
3answers
3k views

How can I move an object on a separate layer behind another in the compositor?

How can I make the light bar, after compositing (applying the blur effect on it), be displayed behind the ball, not in front of it?
12
votes
1answer
2k views

Blender (Cycles) Manual DOF

Is is possible to increase the depth of field in cycles while keeping the same blur size? I know this is not physically correct, but in some renders this would be useful. Here is a demonstration of ...
7
votes
2answers
6k views

Render transperent shadows in cycles?

I am trying to render an animation in cycles without the background. However, every time I have it render, the background still shows up. I used the compositor to add a background image so I can ...
12
votes
4answers
2k views

Where do the white lines come from in my composite?

I'm having this issue for years now, and I'm not sure if I am doing something wrong on my end, or if what I would like to achieve - or expect to see - is even possible. My question is about ...
25
votes
4answers
13k views

What is Ambient Occlusion?

What is Ambient Occlusion and what are some of it's uses? I see it is used in creating what might be called "shadow catchers" in the following node tree setup:
9
votes
1answer
2k views

Using the False Color look in combination with the CDL Node to work on Wide Dynamic Range scenes

The color management for working in cycles can be enhanced to work with wide dynamic range scenes. The idea is to enable working with scenes containing values that exceed the conventional 0-1 range. ...
11
votes
1answer
4k views

Controling compositor by python

I've been looking at the python code loging of Blender. But in there things get loged as mouse clicks. What i like to do is combine a few images into a larger one using compositor, but i need control ...
8
votes
3answers
6k views

Cycles: How do I exclude the Environment Texture from reflections?

In a Cycles scene I have an equirectangular image serving as an Environment Texture background (set in the World settings). I have a glossy object being partially lit by the Environment Texture, as ...
4
votes
1answer
225 views

Is there a way to utilize emissions in VFX?

I have a piece of footage that I 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 layout. I then ...
8
votes
4answers
4k views

Using mask as a garbage matte to hide an object

I'm trying to use a mask to hide a part of a render layer, so that when the render layer is shown over a movie, some parts in the movie will appear to be in front of the render layer. For example, ...
13
votes
2answers
14k views

How can I add Lens Flares/Halos?

Is there an addon, or an easy way to add lens flare effects or light aberrations in Blender? I've been using Blender for a while now, and it's very time consuming to always have to export to another ...
9
votes
1answer
6k views

Composite a 3D object into a photograph

I was wondering how you would go about putting a 3D object into a photograph so that portions of the image are: In front of, or Behind the model. For example, a photo taken from the roadside with a ...
2
votes
1answer
2k views

Combining .exr files?

Is it possible to composite multiple .exr files into a single .exr file? For example, if one .exr file contains several passes and another contains only one pass could they be combined to contained ...
7
votes
1answer
2k views

how to make a z-depth AND height pass?

Struggling to work out how to make a depth AND height pass, so I can use them in compositing an animation of a city. Depth is easy...height, not so... Is there some way to mix a vertical gradient ...
7
votes
3answers
2k views

How to combine low sample renders?

I am rendering my scene with only one sample but all the renders of the same picture have a different seed value. How can I combine them correctly? I wrote a java-program that loads all the images and ...
6
votes
1answer
520 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 ...
4
votes
3answers
7k 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
2answers
15k views

How to composite in a background picture?

This is a diagram: Look at the background carefully... This background was made in compositing: http://www.filedropper.com/xtruder22 However, I wanted to know whether I could put a better ...
7
votes
1answer
6k views

Use custom properties (variable values) in the node editor

An object's Custom Properties panel looks like a great way to inject variable values in the Compositor: However, there does not seem to be an Input that defines a reference to the Object Data's ...
5
votes
1answer
878 views

How can I drive the Switch nodes True/False value?

In the compositor I would like to add a driver to the Switch Node. I want to watch a frame value from a VSE strip. When the current frame count equals the Strip start frame I want to switch the node. ...
3
votes
1answer
4k views

Compositing fog destroys PNG alpha in Images as Planes when using Cycles

I'm following Andrew Price's spaceship tutorial and taking advantage of the inbuilt addon called Import Images as Planes. Here you can see 2 Images as Planes used for the steam columns, close to the ...
14
votes
2answers
10k views

How do I use nodes to combine two images when both have transparent areas?

Is there a way to use nodes to combine two images if both the images have transparency (i.e. alpha channels)?
7
votes
1answer
1k views

Compositing: When to use premultiplied alpha?

When should one check the Convert Premul box on nodes that use alpha? Secondly, why is there a Premul slider on the Alpha Over node? When would you need it to be something other than 0 or 1? I ...
8
votes
2answers
1k views

Does an HDR environment texture affect the Shadow pass?

I am compositing a scene using a standard process in Cycles, and it worked correctly as long as I had my lighting setup in the scene, however when I switched to HDR, my Shadow pass seems to become a ...
6
votes
2answers
2k views

Why does the shadow pass not account for mesh lights?

Why don't mesh lights affect the shadow pass? For example: I have a simple scene with a mesh light and an area lamp: However, you can see that the mesh light does not affect the shadow pass: Why ...
5
votes
1answer
7k views

How to create a shadows pass in cycles?

Everytime I am doing one thing another problem comes up, and I have a deadline to follow unless there is a way to create shadows using another software (after effects)? I want to composite this thing ...
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 ...
13
votes
1answer
9k views

How to convert a normal map into a curvature map (per pixel curvature)

I am trying to generate a sharp curvature / cavity map in the compositor from a normal map but I don't know the node setup. Here is my reference: http://polycount.com/discussion/comment/2273084/#...
14
votes
3answers
6k views

How to get a smooth curvature map from a normal map?

I am trying to generate a smooth curvature map from a normal map. I already know how to generate a sharp curvature (from this post: How to convert a normal map into a curvature map ) Here is the ...
5
votes
1answer
5k views

How to generate a fake hand painted texture (Blizzard like), Borderlands effect or Pixel Art effect

I want to generate a texture that looks like it has been hand painted to use with a game asset by baking the details of the high poly on the low poly, then composite the textures to get an hand ...
16
votes
1answer
2k views

How to achieve screen tearing effect or video glitches

I do not know at all what this effect is called, therefore I cannot search for the answer on the web. I am referring to the thing where the RGB color will shift individually when the camera jitters/...