Unanswered Questions
1,757 questions with no upvoted or accepted answers
8
votes
0
answers
303
views
how to write a custom projection type?
Is it possible to create a lens shader with EEVEE/Cycles ?
I'd like to have the control over the camera position and the ray direction per sample. This allows to simulate various conventional lens ...
- 60.3k
6
votes
1
answer
4k
views
Separate alpha from color in Shader Editor
In the Shader Editor, I can create an RGB node and in there, I can set an alpha value as displayed in this screenshot:
However, no color separation node in blender supports extracting that value and ...
CommunityBot
- 1
6
votes
1
answer
2k
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 ...
CommunityBot
- 1
5
votes
0
answers
154
views
Flat shading when using displacement or bump
When using a bump or displacement node and bump only or displacement and bump in the material settings, the shade smooth option seems to not be working. Instead the geometry starts to show, auto ...
- 51
5
votes
1
answer
492
views
Which format for saving transparency from bloom and respecting colors (tried PNG/TGA/TIFF/EXR)
TL;DR: How can I properly save a picture with semi-transparent "emit" pixels coming from a bloom? I understand that .PNG can't handle that, but I'd expect TIFF/Targa/.EXR to handle it ...
CommunityBot
- 1
5
votes
0
answers
322
views
Custom shader script in compositor (de-linearize depth buffer)
Some months ago I wrote a minimal opengl 2.5d game engine with pre-rendered backgrounds (such old Resident evil, Alone in the dark and Final fantasy games). Depth is managed through a grayscale image ...
- 3,072
5
votes
1
answer
909
views
get this gradient style in blender
I'm trying to get this gradient style:
My best result are with eevee with volumetric and gradient on a metaball, but i cannot figure out how to get the gradient fill the totally of the metaballs like ...
CommunityBot
- 1
5
votes
0
answers
698
views
Control image texture source from outside node group
I'm working on turning a cavity node setup I found online into a node group I can append to my blender files.
The setup uses several mapping nodes (that I already converted to math nodes so the ...
5
votes
0
answers
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 ...
- 51
4
votes
0
answers
29
views
translucent white resin with embeddings - material
I need to make a volumetric translucent material, possibly working in EEVEE.
It is a white semi-translucent resin with objects embedded.
The embedded objects are more visible near to the surface of ...
- 41
4
votes
0
answers
218
views
Migrating geometry shaders to Metal
I'm working on BlenderBIM (architecture addon for Blender) and we have a bunch of shaders to support plan annotations in viewports. Mainly it's simple shapes based of lines - lines, segment based ...
- 456
4
votes
0
answers
377
views
Drawing non-polyline smoothed lines with `gpu` module
Backstory:
Since bgl module will soon to be deprecated and it's doesn't work on Metal already I was trying to move code to gpu ...
- 869
4
votes
0
answers
192
views
Custom nodes, node limits, and compile times
I am working with some very complex custom toon shaders in Eevee. This causes several problems. First, the compile times are atrocious. Second, I am in danger of hitting the node limit if I also use ...
- 6,647
4
votes
0
answers
341
views
Understanding Blender's Invert Node and Varying Bit Depth Images
So, I am trying to wrap my head around exactly what the invert node is doing in the shader editor.
I realize that this sounds like the most simplistic question in the universe, but please bear with me....
- 1,433
4
votes
0
answers
400
views
Is it possible to apply ocean modifier for only one face of geometry?
I was trying to recreate this illustration with my limited knowledge.
And while doing that I tried to follow some tutorials. In one of the tutorials, the animation done with ocean modifier and ...
- 13.7k
4
votes
0
answers
442
views
Shading according to velocity
I have a rigid body simulation of many objects and would like to change how they're shaded depending on velocity. It's easy to get location from object info node, but how about change in location ...
- 355
4
votes
0
answers
180
views
Possible to give a shadow a different material?
Hello.
Let say that in a this image, i'd like all shadows to be rendered as an red emissive material, is this possible in render ? procedurally, witouth any modifiers, just by the shader editor ?
- 1,942
4
votes
0
answers
883
views
Simulate light bending due to gravity
I'm trying to demonstrate light bending due to gravity, but my knowledge of Blender isn't up to the job.
As a test I have a sphere with the Glassy BSDF shader. The colour is set to white, and I've ...
- 981
4
votes
0
answers
654
views
Alpha textures show only when selected
I'm making a radar display animation (those spinning once) for a movie project. What I do is:
Set up a material in cycles to see how it fits together (using b&w images)
Create alpha textures to ...
4
votes
0
answers
4k
views
Alpha transparency not showing in cycles viewport
Using cycles I have simple cut out people in the scene: planes with .png textures on them. The transparency shows in the material editor and is rendered correctly but is not displayed in the viewport. ...
- 187
4
votes
0
answers
4k
views
How to export smoothing groups made with Auto Smooth?
I know that there is an Edge Split modifier, but it actually splits geometry edges, which causes problems with further modeling. When I use "Shading: Smooth" and then enable Auto Smooth, it works nice,...
- 511
4
votes
0
answers
103
views
GameEngine: KX_BlenderMaterial vs KX_PolygonMaterial
I have a question about the material types in the game-engine.
e.g.:
2.66 Blender API - KX_PolyProxy(SCA_IObject)
2.66 Blender API - name ~ The material of the polygon.
When is the material a ...
CommunityBot
- 1
3
votes
0
answers
26
views
Cycles and OSL : how to implement a custom closure
I'd like to implement a custom shader in OSL (Open Shading Language) to reproduce the Hapke reflectance model (it allows to visualize the opposition surge effect, visible on the moon for example).
I ...
- 31
3
votes
0
answers
110
views
How can I optimize this Minecraft-style flood fill voxel lighting system I made in geometry nodes?
I made this flood fill/breadth-first search style voxel lighting system using geometry nodes. However, due to the wonky set-up I have in the repeat zone, it lags quite a lot when the light is moved. I ...
- 96
3
votes
1
answer
43
views
How do I over lap three or more render layers in the compositor?
I'm trying to place three images on top of each other using the compositor. I don't really know how to do it, I think I could use the alpha over approach but I'd need to use the alphas of both the ...
- 63
3
votes
0
answers
310
views
Experimenting with creating an opal-like material (UPDATE)
I've been wanting to create a material that attempts to mimic the look of a white opal gemstone. The biggest issue I am having is figuring out how to effectively create the streaky rainbow effect on ...
- 75
3
votes
0
answers
120
views
Complementary Colors using the Color wheel
In Photoshop, I can find the complementary color easily by adding 180 to the Hue (or subtracting 180, if the Hue is already over 180).
Since Blender maps the color Wheel from 0 to 1, shouldn't I ...
- 55
3
votes
0
answers
379
views
Why does bloom not work over a transparent background?
I'm using the Eevee engine and the fireworks are emissive particles, bloom is turned on.
I tried both eevee and cycles, I want to use eevee though.
I tried PNG with RGBA color, 8bit and 16bit color, ...
- 31
3
votes
0
answers
304
views
What happens to UV Tangents when using Custom Normals?
Tangent Normal mapping is done with the mesh Normals and UV Tangents. For it to work, these are supposed to be consistent with those used when baking, and orthogonal to each other. When you set Custom ...
- 6,647
3
votes
0
answers
1k
views
How to recreate PS1-style vertex lighting?
How would I recreate per-vertex lighting for a PS1-looking model? Vertex colours almost work, but they do not account for lighting. Is there a solution?
Example render:
- 25.9k
3
votes
1
answer
343
views
Geometry Node Attribute Unusable on Density (Shader Nodes)
I've found something weird. I have an Fac Attribute in my geometry nodes (it's a simple gradient). When I use it in Shader Nodes, it works, but not for the density value on volume absorbtion or volume ...
CommunityBot
- 1
3
votes
0
answers
472
views
Dilate/Erode image in Shader Editor?
In the compositor you can dilate/erode an image based on pixel brightness, like this :
I'm wondering if there is a way to do the same in the Shader Editor (maybe with some clever vector math?).
I'm ...
- 2,530
3
votes
0
answers
910
views
How to make an object cast shadows on other things but not itself? (Eevee)
I'm trying to make a low-poly model, and it looks very weird with casting shadows on itself. I'm trying to have it essentially only use vertex shading, not cast shadows, on itself. However, I still ...
3
votes
0
answers
262
views
Material Color from Rotation Angle
I basically have a two-part hinged lever. One arm is fixed, and the other arm can rotate in Y 0 to -45 degrees (X and Z are constrained to 0). So it's rigid body active -> hinge -> rigid body ...
- 149
3
votes
1
answer
67
views
Compositing transparency challenge. Particle not part of alpha?
Hey Wicked Smaht people!
I have been working on a project that will be super imposed, in photoshop, over another image.
So, I have been trying to composite it so that the background is transparent.
...
- 581
3
votes
0
answers
217
views
Aperture Science portals using OSL
I am wanting to create Aperture Science style portals, And I’m aware of various compositing techniques to do this, but to make it more flexible I am thinking about using Open Shading Language. I do ...
- 12.7k
3
votes
0
answers
179
views
Procedural tile texture with different column width and tile lengths
I'm quite new to textures in Blender and still trying to understand how to create procedural textures using nodes. I'd like to create an approximation of these tiles. There are three column widths, a ...
- 31
3
votes
1
answer
74
views
Can someone explain why my Color Space options are different from any tutorial or documentation I've seen?
I'm wondering if anyone can explain what I'm seeing when I use the "Color Space" drop down on a Image_Texture node? No tutorial or documentation seems to have any info on this. I'm just ...
- 51
3
votes
0
answers
268
views
Recreating colored glass shader from VRay/Max to Blender/Cycles
Edit: Blend file:
I am converting a somewhat simple scene from 3DSMax/VRay to Blender/Cycles. I'm almost done with the conversion, but I am having trouble with matching the glass shader used in the ...
- 12.7k
3
votes
0
answers
617
views
Emission node with alpha blend is colorless in png
I have created the following flame material. You can see that the flame is red and emissive. Otherwise, the rest of the material is invisible, since I have "Blend Mode: Alpha Blend". ...
- 131
3
votes
1
answer
94
views
Using CFD temperature data to generate lighting
I have a VTK file that contains volumetric data on the temperature at different points on a flame. It has been obtained using a CFD simulation, with the file containing different values of temperature ...
- 13k
3
votes
0
answers
233
views
Odd shadow cutout
I'm very new to Blender (10 hours in!), and I'm coming across a problem I haven't been able to successfully google.
I have an object casting a shadow on a plane. I'm using an Area light pointing ...
- 31
3
votes
0
answers
94
views
Alpha channel not responding to blur?
Here is a still of a shallow focused camera of a few flowers. As you can see the pink flower alpha blend is not responding to the blur... How do I ensure it is blurring like the rest of them?
- 12.4k
3
votes
0
answers
69
views
Is it possible to shade objects in Cycles based on Z gradient, to highlight/darken edges?
I'd like to shade the edges of my objects darker, like a toon shader, based on abrupt Z depth transitions to neighboring pixels -- in other words wherever the Z gradient is high, darken the image. I ...
- 535
3
votes
0
answers
24
views
Sculpt Alpha brush/texture add and substract simultanously
Is there a way to use an alpha brush/texture where the dark carves into the mesh while the white extrudes at the same time. I could only figure out that you can set a brush to add or sub but in that ...
- 31.6k
3
votes
0
answers
71
views
Accessing the Render Engine Type as a String from a Driver Expression
I am trying to make a Render Engine switch for node-trees, that will give control over ignoring or using certain node-chains depending on what render engine is used.
This is basically an improvement ...
- 1,821
3
votes
0
answers
71
views
What happened to the color pallete?
Why don't I get the normal color pallette in my material? what happened? I've never seen this before.
My color palette is seemingly faulty. I am sure it is not, rather I am surely at fault, but I ...
- 60.3k
3
votes
0
answers
134
views
Displacement on Particle Location
I am trying to create a shader which uses displacement to create a dent in an object with a hair particle system, based on the locations of the hair particles.
The strawberry I have created is setup ...
- 31
3
votes
0
answers
1k
views
How to create a SOBEL shader?
I've been curious as to how recreate the sobel (edge detection) node from the compositor into the shader editor.
It seems the general method consists to create an highpass image and then use a mixmode ...
3
votes
0
answers
102
views
How to stack displacement nodes?
When using displacement modifiers, you can use the resulting mesh normals of the first displacement as the base for the second, such that the end result is a 3 dimensional displacement.
For example, ...
- 12.4k