Questions tagged [shaders]

A shader is a computer program that usually runs on a GPU and is used to do shading, texturing, special effects or post-processing. Shader nodes specifically refer to the nodes used to create shaders for Cycles, but this tag can be used for other shaders as well.

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7
votes
1answer
965 views

Why does refraction + volume scatter cause a much darker result?

I've noticed that glass objects tend to turn really dark when adding volume scattering. It seems the volume scatter shader gives a much different result when a refraction shader is used in the ...
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0answers
36 views

How can I integrate the reflection of CG object over a photograph? [duplicate]

So I'm trying to learn some basic VFX to do CGI in the future, and I've started by putting 3D objects in an image. So far, I've got the shadow catcher working, but I can't figure out how to make the ...
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1answer
747 views

Keep texture shadeless, but recieve shadows?

I'm working on a VFX shot where I have created a clean plate that is motion tracked to go over a store sign. I made some 3D text to put in its place, but because the clean plate is shadeless, the text ...
4
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1answer
212 views

How to make this animation look more like a satellite orbiting a binary star?

I'd like to increase the reflected light from the two rotating stars off of Suzanne the satellite, without making them appear brighter to the camera so that the pulsing of the two colors is noticeable....
0
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1answer
33 views

Why constraints ruins material set up?

I'm creating a scene with planets, and I wanted one planet to track to the camera (but not in 100% percent). But when I want to render it the "fresnel node" is acting weird. Why constraints ruined my ...
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2answers
129 views

Does Cycles calculate 0 factor shaders?

If you have a material with shader nodes that are at 0 factor in a mix, does cycles still have to spend time processing them?
6
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2answers
927 views

How does the mix shader work when using a Fresnel node as a factor?

I have been using the mix shader to get different types of metals by mixing diffuse and glossy, I always get good results. However there is a thing I have not understand yet: why the material changes ...
3
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1answer
180 views

Removing black-ish tint in beveled area of clear glass

I can not seem to gt rid of the really annoying BLACK that always seems to show up in Blender Cycles when rendering glass. I've even used a transparent shader to NO avail.
8
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3answers
7k views

Procedural polka dot pattern with cycles

I would like to generate a polka dot pattern using material nodes. In the meantime I found this script which seems to achieve exactly what I want. However, when I create a script node, link to the ...
0
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0answers
38 views

Dark texture on model, even on solid appears also in texture mode

when I go into texture mode I get a pretty weird look of the "body" of the robot, the hat is good though things i've tried remove doubles change some stuff in shading (I'm bad at this though) flip ...
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0answers
30 views

How do I fix the black and white? [duplicate]

kind of new to blender, not sure what to do exactly could someone help me? [![enter image description here][2]][2]
5
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2answers
628 views

Basics of Cycles shading

I have been using Blender for few months on and off. I keep learning and forgetting how to do things. The problem is I don't have a solid understanding of few key things in blender especially about ...
6
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2answers
1k views

Is there a way to round corners on material level?

Is there a shader that can be used on material level that will give the effect of round edges when assigned to an object? I'm not looking to increase the mesh density, I remember in 3DS Max, Mental ...
3
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2answers
570 views

Additive Emission in Cycles [duplicate]

Question is how to create additive shader. If you need particles which just "add" light to a scene. Not render a surface but create emission. If color changes from yellow to red for example, the ...
7
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4answers
981 views

How do I color the shading of a material?

Some art styles increase the saturation in their shading, I'm trying to achieve this effect as seen in cell #2 of my example image. Right now it looks like cell #3, which lacks this and looks dull in ...
2
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1answer
2k views

How to manipulate Gradient Shader

Being kind of new to Blender, Shaders are still kind of a mystery for me, I tried adding a Gradient Shader to the Background in World, to my surprise, I couldn't find any sliders or colors! is there a ...
0
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2answers
361 views

Mix shader not behaving as I expect

I'm trying to make sparks that fade out over time, and I'm pulling my hair out trying to get the nodes to work properly. It seems like the mix shader node is doing the exact opposite of what it's ...
0
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2answers
224 views

shader.setSample invalid uniform value

I'm having troubles with my "clouds" texture while trying to sample it into my shader, the error is "invalid uniform value: clouds" ...
0
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1answer
586 views

Blender 2.77 - glass shader looks like glossy shader [closed]

I downloaded Blender v2.77 and try to render Suzanne with HDRI Lighting. First I've used a glossy shader, then a glass shader and it surprises me that the glass shader totally looks like glossy, it'...
1
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1answer
382 views

How can I do bumped textures in Cycles?

I was trying to follow this tutorial here: https://www.youtube.com/watch?v=i7aLH7XDhZ0 But I noticed those fields only show up in Blender Render. How can I achieve this same result in the Cycles ...
1
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0answers
68 views

Cell shaded effect

Is it possible to get a cell shaded effect on blender similar to the image below? http://gamegrass.com/game_img/2013/02/01/754.jpg
2
votes
1answer
607 views

Materials modified with GLSL in bge, return to original material (using only python)

I'm a noob and probably this is a completely silly question... Started using BGE two days ago... I'm using GLSL to visualize a distance field while running in standalone player. I'm doing it using ...
4
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1answer
2k views

How do you make a cycles volume material fade to invisible at the edges?

I'm trying to model a spark using Andrew Price's tutorial (Blenderguru), but the sparks always look wrong. You can always see the outline of the ico sphere. I'm wondering if there's a way to soften ...
3
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1answer
558 views

OSL Script node: Slider with value range between 0 and 1 (like Fac)

I am currently writing my own shader using a Scriptnode in Blender, and I cannot figure out how to limit the range of a slider between 0 and 1. I basically want something like the "Fac" slider in a ...
2
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3answers
472 views

multiple texture in a Single material

I want to use two texture in one object(curtain), upper part of it will be designed texture and bottom part to be solid color or different texture .People said to use baked texture or color different ...
0
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2answers
273 views

How to achieve this effect? Does it need a custom shader?

I would love to replicate this effect in Blender, but have no idea how to approach the problem. Does it need a custom shader? and if yes, can you link me to references/guides on how to achieve a ...
6
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3answers
6k views

Why does an object with a glossy shader render in black?

When I apply a glossy shader to the material of my text, the text becomes just black. Why? I have lamp and everything, but the problem persists. The text is red before I add the glossy shader. I'm ...
3
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0answers
883 views

Cycles Procedural Texture Study [closed]

I've become very interested in procedural textures as of recently. I would like to start building my own library of these textures, so I can easily texture scenes without having to search for ...
2
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1answer
176 views

Can multiple render systems be used?

I was watching a tutorial how to design an island in Blender, which worked really great, but i didn't want to use the .png Trees the guy used there. So i watched another tutorial and created another ...
3
votes
1answer
3k views

Procedural texture is stretching

I have this procedural texture which creates a little camouflage pattern, but it appears to be stretching on the hull of the plane. Here is the node setup, super simple. And here is the issue. You ...
8
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2answers
3k views

Slope of geometry as `fac` input for cycles material

I have a terrain with two materials going into a Mix Shader, I want the fac input to be the slope of the terrain. Steep parts should be one color, flat part another.
6
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2answers
3k views

Can PBR be “faked” in Blender Internal or the Game Engine?

Physically-Based Rendering / Physically-Based Shaders My very basic understanding of physically-based shaders is that they have an accurate Fresnel curve (becoming more reflective at grazing angles), ...
0
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0answers
532 views

What are other ways to fake underwater environment?

The most realistic way to create an underwater scene is using volume shader, but looking for a more faster way(i.e. to fake), are there any ways besides these. I tried to search up for it but it doesn'...
1
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0answers
74 views

Select faces by shader?

Say I have a Mix Shader in a node setup. Say I have a Wave Texture connected to the 'fac' input on this said Mix Shader. I'm assuming that this functionality isn't built into Blender, so how can I ...
1
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1answer
405 views

How would I make an Iridescent Yellow Chromate material? [duplicate]

How can I make this rainbow looking iridescent yellow chromate plating found on metals?
1
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1answer
426 views

Glossy node isn't reflecting

On the neck label of my Jack Daniels bottle I have the glossy node plugged in but as can be seen in the image -- it's not reflecting. I tried adding another glossy to 'double' the glossiness but that ...
1
vote
1answer
790 views

Conflicting faces rendering as black

In my blend file here, I'm trying to write a shader that uses a gradient to mix between transparency and the surface material. So far, I've managed that. But when transparent, the object shows black ...
1
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0answers
98 views

Is it possible to determine emission shader value by other lights?

Is it possible to take a lamp/sun/point light and use it as a value on the scene to tell materials that are not affected by the light source to emit their own light? This is photoshopped example of ...
7
votes
1answer
292 views

How to make original full-pass image from separate passes?

I'm trying to create an image from separate passes. That is, I have a result image, which without altering the composite Combined RGBA buffer looks like following: On this image you can see a cube ...
2
votes
1answer
748 views

Simulating the atmosphere

Some months ago I watched this video of Blenderguru about "How to create a realistic earth in blender". In this video blender render is used and now that I understand texturing in cycles a little ...
1
vote
2answers
242 views

Cycles Rendering Issue

I have an issue..when I use cycles render and I use color, normal,occlusion and spec map I see some lines.(I think they are the marked seam lines).It look like the 1st picture here. But when I take ...
2
votes
1answer
1k views

How does Color Mix (Difference) node work?

How does the above node setup work, and what will happen when I change the Fac value (0-1)? What calculation is the mix node doing here when set to Difference?
2
votes
1answer
247 views

One part of the model looks glossy?

Why does the head look so shiny compared to the body? I haven't added any texture yet, I think. (I'm still new to blender) I tried changing the matcap but it still looks very glossy. How can I get rid ...
2
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0answers
23 views

No materials showing up in cycles [duplicate]

So im trying to make a minecraft animation test with my world and i want really good lightning. The only problem is when i render in cycles none of my materials show up like they do in blender render.
0
votes
1answer
335 views

Weird lighting and how many tris for games

I'm new to blender, I am looking to create a game using unreal 4. That being said, how many tris are too much? currently working on a character's boots and am riding at over 2000 for just one of them....
3
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0answers
61 views

What is the significance of the value of the limit on the roughness attribute of the Oren Nayar shader?

In exploring the settings of the Oren Nayar shader in the Blender internal rendering engine, I find that there is an upper limit of 3.14 for roughness. Is this the constant Pi? Why is this the ...
1
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1answer
442 views

Materials in the game engine have no shadows

I am trying to make a game in blender, but any material that I add to anything in the game has no shadows
2
votes
1answer
140 views

Distorted Shading on Model

My model keeps getting distorted shading despite my attempts to fix it. I'm guessing it has to do with some star junctions on the model. What would be a possible solution to this problem and how ...
4
votes
1answer
132 views

Why is blender using so few resources

Right now I am doing the final render on my light-saber and previously when I would render objects with around 1000-3000 samples depending on the complexity it would take maybe an hour but now blender ...
6
votes
1answer
738 views

What are some good low-poly scene techniques?

Recently I have noticed that low-poly art has really come into vogue, and I thought it would be helpful if we could collect some helpful concepts and techniques in how to replicate this style. How ...