Questions tagged [nodes]

Nodes are used in the Node Editor for compositing, post-processing, creating materials and textures. Use this tag for anything node related.

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Copy scene node tree to other scenes

I have a Blender file wih many scenes and I want to copy the node tree of one of them to the other scenes. From Blender interface it is a very simple task, in python I have tried using bpy.ops.node....
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175 views

Get image pixels from multiple viewer nodes

For Blender 2.81 and Cycles render. I want to access all of the following data passes from a Python script: Z Normal ...
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279 views

Update function for NodeSocket?

How do I set a callback for socket input change (value or link change) when having a custom node? I have a socket defined like: ...
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83 views

Is there literally NO way to start a particle animation when the particle is emitted?

I've been battling the particle system for over a week now without any success. A little context to what my issue is: I'm using an instantiated collection(!) with 4 meshes in it as particles, each of ...
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269 views

Eevee Linear / Cubic Texture Interpolation Complex Node Issue / Bug

A friend has been working on a project, and they have run into issues with using Linear Interpolation & Cubic Interpolation with their complex node tree. This node tree will be working with low ...
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31 views

Gradient texture loses effects in linked smoke simulation group

I have created a smoke simulation with the following node-setup as the material. The three nodes on the far left allow the lump in the center of the smoke simulation to lose their density. The ...
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149 views

Is is possible to get boids data to animation nodes signalling when they are 'attacking'?

I am creating a space dogfighting scene and I have been able to hook up the particle boids to animation node instances, including positions and even the rotations by normalizing the velocity and ...
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122 views

Compositor File Output Node overwrite?

In the Output tab of Render settings, you can set the output options for rendered animation. One of the options is to have new renders overwrite the previous ones or not. The File Output node in the ...
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2k views

nVidia skin shader with the Principled BSDF

I've been using a skin shader primarily based on the Brecht skin shader, which is itself based on the Sum-of-Gaussians approach as seen in 14.4.7 from GPU Gems by nVidia. Its Cycles adaptation, which ...
4
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1answer
1k views

How to update compositing nodes via script?

I create some nodes in compositing via python script: ...
4
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3k views

How to create an all-around night sky in Cycles?

So I created a night sky following this video https://youtu.be/9vbq6HOgA2w It was going pretty well until I noticed that only half of the world actually looks decent. The bottom half/ middle is this ...
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625 views

Copy node tree from one material to another in cycles using python

I have two cycles materials (say source and target). I want to copy the Shader Nodetree from the source material to the target material after clearing any currently present node tree(s) in the target ...
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111 views

Is there a way to get the vector to the closest UV seam?

I am looking for a way to get the distance to the closest UV map seam in UV-space as a vector in the node editor. Like this: The blue dot is the current point of reference, i.e. the point where the ...
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637 views

nodes in blender game engine

I have an issue while tring to set up a material for blender game engine. You can see the setup on the image, and the BGE doesn't render my purple object that's on the View panel.
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378 views

Use value of node output for driver

Situation: I have an Object that rotates (keyframed). I use Nodes and Drivers to set the objects color to blue within the first quarter of one whole rotation (90°) and red for the rest (270°). That is ...
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647 views

How can I use a node-based texture for smoke flow in Cycles?

Preface: I'm thinking that this might be a bug, because the behavior's pretty weird. I'm posting it here in case it is the intended behavior and there's some trick I should use. I can successfully ...
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22 views

How can I get shader node values based on object angle?

I'm trying to automatically change a blackbody's value based on a sunlamp's directional angle. When the sunlamp shines horizontal, I would like to have a minimum value represented in the shader ...
3
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541 views

Everything Nodes?

A few years ago in blender community exploded an information that blender will make some game changing feature, they called Everything Nodes, but to this day, we have nothing more than one short video ...
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179 views

Pointiness to Vertex Colors for EEVEE

I am attempting to create some Procedural Weathering Effects on a high-poly model using a similar Pointiness method to that discussed in my previous question and answer here. Whilst Cycles provides ...
3
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59 views

How to properly rotating a material using node which has a normal map?

Rotating normal map via mapping node seems will flip normal map, resulting a weird looking material. But directly rotating uv map in uv editor doesn't cause any issue. So how to properly rotating a ...
3
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1answer
252 views

How to make node group of an existing material into a new group? (in python)

This is what I would like: I'm looking for an alternative to bpy.ops.node.group_make() Because it seems like a bad approach. I simply want to group a new group ...
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42 views

Using texture data from texture properties as node data in Cycles

either I'm clearly missing something or I misunderstood the concept, but I hit a wall with something that should be pretty easy (provided it is already implemented in Blender). I'm basically creating ...
3
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0answers
48 views

texture mapping without texture being mirrored on other side of object

I have a cylinder I want to map a texture to. To specify the location of the texture I use an empty. In the material node editor I then use the object function of the texture coordinate node and ...
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86 views

Is there a way to get a node's dimensions without displaying it in the Node Editor?

The aim of the question is to calculate a node tree layout for a generated node tree. Nodes have height, width and ...
3
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1answer
80 views

How can I sharpen the light fall off for a rotating earth animation with 2 materials?

Intermediate level question. I have been following Andrew Price's excellent tutorial on "How to make Earth". I have managed to "create" earth, and render as a static image. I have returned to this ...
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174 views

Irregular shapes texture

Below is the type of texture I wish to generate using Blender's node system. Thus far, I have tried using a mixture of Blender's base textures, noise, magic, voronoi etc. I have attempted to combine ...
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0answers
2k views

How to see the shader preview?

In shader editor , how can i see the preview of the shader or any nodes without it's being applied to objects ? something like 'viewer' node in compositing editor. Right now if i have lot of 'image ...
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0answers
61 views

Node Group separator for parameters

Is there any way to add separators to better organize node group parameters?
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82 views

How do I curve procedurally generated textures (Clouds)?

I'm quite new to blender and am still getting the hang of things. Having followed BlenderMaster's tutorial on creating clouds, I've managed to create something like this: I already know how to move ...
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222 views

Rendering to Viewer Node in headless mode

I'm running Blender 2.79: /path/to/blender -b empty.blend -P script.py With script.py: ...
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298 views

Nodegroup: Missing data block

A Cycles node group in a file of mine seems to have lost its data block somehow. The group still shows its inputs and outputs properly, but the name of it has changed to Missing Data-Block, and no ...
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0answers
78 views

How do I find which materials are using a particular node group

I have a blend file that I am using as a materials library. I have discovered that there are node groups that were not named, so I have a collection of NodeGroup.xxx groups. I would like to find the ...
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0answers
324 views

Creating nodes with dynamic number of input sockets?

Is it possible in any way to create one's own node type in one of the node editors (let's just say the Compositor for example) that can have a dynamic number of inputs? Not a group node, just a ...
3
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1answer
139 views

Help figure out where this phantom rust is coming from

I have an object with two non intersecting UV Maps. One UV Map (round.red.light.decal) is to place a red light decal (round.red.light.png). The other UV Map (rust.map) was used to draw an image mask ...
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0answers
124 views

How to control materials falloff type from perpendicular/parallel to fresnel using nodes?

I used to create falloff maps in 3dsmax quickly and easy. Now I would like to be able to do the same thing in blender. Currently I am using Toggle diffuse ramp operation in blender, but it only ...
3
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0answers
375 views

black displacement artifacts using micro-displacement and adaptive subdivision

I am currently using micro-displacement along side with adaptive subdivision. However I have stumble upon a weird artifact. As you can see there are some black pixelated artifacts along side the ...
3
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0answers
170 views

Scripting an “open image” button input for image/env. textures?

Is there a way to script out a normal image/environment texture node with the exception of an "open image" button input that can be plugged into a node group and have that button actually be displayed ...
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0answers
665 views

How to create topographical contour lines ?

I am working on engraved cave walls, got from 3D scan. I would like to create topographical contour lines (maybe not "lines" but "ranges" ...) in order to see better the engravings. I have already ...
3
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0answers
65 views

Defcous Node algorithm

I am working with Blender to generate defocus images using the Defocus filter it provides in the Node Editor. The official doc says that the blurring is done as a "post-process" using the Z values in ...
3
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0answers
602 views

Using data with python nodes

I have created a number of python nodes inside my own tree. I have one node that takes one input and has a button called "Simulate". This is an operator that is held in another file. Currently all it ...
3
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0answers
116 views

How can I use a mask in World Textures

I have a cycles world setup with 2 textures rendering out as equilateral (for 360 deg video). I would like to use either a mask shape or an object from the filed of view as a mask between the 2 ...
3
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0answers
190 views

The problem of distortion on the composite

Hi all, I have a problem. I will render an object, is simply a box, get the rendering, compositing, then distort it. As a result of rendering over a live video the cube is smaller and renders with a ...
3
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0answers
72 views

How to create an image whose alpha value changes according to a curve through time in node-editor?

I connected an image-node with a composite-node and connected a value-node into the alpha of the composite-node. I changed the values and the image changed its transparency. Then, I connected the ...
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0answers
4k views

How to make procedural wood material with knots?

Recently I saw new cycles wood shader from CG Cookie, that looks very impressive and I was wondering if it is possible somehow to mix few wave textures to achieve natural looking knots on the wood. ...
3
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0answers
492 views

OSL: Giving the texture method a color instead of string

Is there a way to give the OSL method texture(string, float, float, ...) a color input instead of the string which reads an image file? Or is there any type of ...
3
votes
1answer
1k views

How to crop image based on Alpha in Compositor?

I wonder if there is any way to crop a image based on alpha data like this: The reason I want to do this is that I want to crop the White area of another image (of the same dimension to the Alpha ...
2
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0answers
107 views

How to get bounding box of multiple objects in a rendered image with Python?

Hello I am trying to get bounding box of items in my image which is generated automatically using a script by running blender from background. I am using the object index to get the boxes. This is my ...
2
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0answers
37 views

Transparency showing as black on a mix shader (multiple image textures)

First time here, still pretty new to Blender. I have an object that I've applied an image texture to. The object is a can with a label that wraps around 90% of it. The object's "label" texture ...
2
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2answers
33 views

Why is my color map gradient (by node xyz value) working for x and y but not z?

very new to blender and not an expert. Coming from engineering field and want to learn more about rendering CFD/model results in Blender. Right now I am struggling with adding a coloramp to a surface....
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0answers
20 views

Save just the Material part of a .blend file

Can you just save parts of a .blend file? And link them in later? thanks

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