Questions tagged [transparency]

Transparency can be anything from an alpha-channel in an image, to shaders in the BGE, to transparency in a material, to the alpha pass in the compositor.

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209
votes
3answers
284k views

Can Blender render pngs with the background transparent?

I would like to render an animation as a series of .png images with transparent backgrounds for use in a video. Is this possible?
28
votes
9answers
40k views

Any Video formats that render with Alpha Channel?

Does anyone know if there are any video formats (besides the HUGE uncompressed avis) that you can render in that maintain the alpha channel? (i.e. for after FX etc.) I used to use quicktime, but ...
21
votes
1answer
31k views

How can I make a more realistic glass shader? [duplicate]

Here's a sample scene: A room with a window, a point light to project light into the room, an HDR environment outside the room and a nice Image by Rembrandt that should be somewhat reflected on the ...
20
votes
1answer
5k views

How to render a mesh transparent with a color on its edges only, with nodes?

I would like to have my object transparent, with a color only on the edges, would someone know how to do this? I am starting with the nodes, if anyone can help with some guidelines I would really ...
18
votes
1answer
20k views

Render shadow on transparent background with Blender Render [duplicate]

I need to render a model on a transparent background. The models have a light source so they should be casting a shadow on a surface (the XY plane). The purpose for this is to overlay the rendered ...
17
votes
1answer
3k views

Black artifacts when looking through many transparent objects?

Using v2.73, cycles and a very simple scene: an array of cubes, no big deal. If I set the shader's material to transparent, the cubes in the foreground do become transparent but those far away in the ...
16
votes
3answers
10k views

Why is this glass Cycles material casting solid shadows?

I created a glass cone with black seams (the seams are a diffuse not transparent material). When I shine light on it, the cone casts a solid shadow. Why is this? I would like to have a (semi) ...
15
votes
2answers
12k views

Render shadows over a transparent background in cycles

I'm trying to make a logo that will be on the header of a website. What I'd like to achieve, and the reason I'm using Blender, is the projected shadows on the background looking perfectly real (as ...
15
votes
1answer
11k views

how to render semi-transparent objects with transparent background as a png with cycles

I am rendering out some bubbles for use in a composite Photoshop image, so I need to render as a transparent png with the bubbles semi-transparent. I tried setting render output to RGBA and checking ...
15
votes
3answers
6k views

How to properly render smoke on a transparent background?

When rendering volumes with Film > Transparent enabled, the alpha appears to be the wrong type (premultiplied/straight). In the 3D view it works as expected: This is a known bug. Is there any way to ...
14
votes
2answers
968 views

How do I get rid of unwanted corners inside a bent tube?

I am trying to make a clear tube in Blender and have a water simulation run through it. I made the tube out of a Bezier curve and a circle, then extruded the original until I had the shape and length ...
13
votes
2answers
9k views

Add a transparent image on top of a material [duplicate]

I'm designing this animal-type creature, and want to add a transparent .png image to its face with the face features (object has a subsurf). On the left is the image with the features, on the right is ...
13
votes
3answers
38k views

How to make objects draw transparent/wireframe in the viewport?

I have several objects in my scene. I want all the objects to be visible so that I can see how they relate to one another, but I want to focus on just one. To do this, I'd like to make the other ...
13
votes
2answers
2k views

Making a wall made from glass bricks

I need to make a frosted glass brick wall (see the example) for archvis picture. What is the best approach for it? Using just a cube with a texture of framing grout and glass shader for bricks will ...
12
votes
3answers
5k views

How to create a gradient texture from one material to another (opaque to clear)?

I am trying to render an object that has opaque base and gradually becomes clear/translucent at the top in Blender cycles. Please see the attached image (which was not made with blender).
12
votes
1answer
6k views

Alpha channel through glass material instead of background (Cycles)

I'm trying to render some windows, reflecting an environment map, and to be transparent to let light enter inside the house. There are two windows facing each, and I need to see throught both, and ...
12
votes
2answers
1k views

What is the difference among Alpha Over / Alpha Under / Over Drop?

They are three modes in VSE. I think I know what the Alpha Over and Alpha Under do. But I'm still puzzling when trying to understand what the key difference the Over Drop is from the other two. I've ...
12
votes
1answer
3k views

Importing PNG series with Import Image as Plane is blurred and has artefacts

I am using a series of .png images (from green screen footage) with alpha channels. However, when I try to import image(s) as plane(s) in a rendered scene, the image is blurry with anti-aliasing off. ...
11
votes
2answers
3k views

Is there a way to have Cycles skip rendering alpha?

If I wanted to create an animation, each frame would have several seconds of rendering a completely transparent part, which adds up obviously. Is there a way to eliminate this waste of time?
11
votes
1answer
19k views

Image Alpha Background Renders Black when using “Import Images as Planes”

I must be missing something here. I'm doing an extremely simple Import Image as Plane using the AddOn and the imported image has an alpha background but it renders (and even previews in the material ...
11
votes
1answer
2k views

Translucent plastic foam

I could use some advices regarding a challenging material. As a side note I'm a pretty new blender user, switching from another 3D program. I'm ok now with the workflow and classics shaders, but this ...
11
votes
1answer
2k views

How to render a wireframe & glow lines effect on a house?

I would like to render this kind of effect: I would like to render it on a house. The view should be at the top, and the edges of each wall should be a glowing line. I tried the technique from this ...
11
votes
1answer
16k views

Transparent Background for Animation [duplicate]

How I can have an object in the foreground with a transparent background? I do not want to have a background that is just keyed out because that always leaves halos even when I do the correct lighting....
10
votes
1answer
95k views

Transparent image textures in cycles [duplicate]

I added two planes in Cycles with Image Texture in png with some transparency. I covered one by the other but transparency doesn't work, I mean it is impossible to see the one which is under despite ...
10
votes
1answer
18k views

How can I setup a Material in Cycles for Z-Transparency?

After converting to nodes in order to render using Cycles I've no idea where to enable the z-transparency. I guess the image textures alpha channel needs to be pluged somewhere but I've no idea which ...
9
votes
2answers
12k views

Soft lighting through translucent material in cycles

I'm making an interior scene in which all light comes from a window with a curtain. This is an image that shows the effect I'm trying to achieve: The light source is a plane with an emissive material ...
9
votes
4answers
2k views

Is there a way to add fake thickness to an alpha image texture?

I'm using Cycles I want to add thickness to a texture with alpha transparency like @rich-sedman do in his nice answer here: How can I make a hexagonal grill? But this time with an image texture (jpg+...
9
votes
1answer
10k views

Texture painting on the alpha channel (2.73)

How do I paint on an RGBA texture's alpha channel in Blender 2.73? I'm not actually using it for transparency, so I would prefer to visualize the alpha channel as a grayscale image while painting, if ...
9
votes
4answers
3k 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 ...
9
votes
4answers
36k views

Why is the alpha channel not working?

I was trying to make a really low poly flower, basically using 2D planes and applying textures with an alpha channel (Targa, 32 bit). However when doing the UV mapping and applying the texture as ...
9
votes
1answer
3k views

Render semi-transparent volume with cycles

I want to render an image of a fire in cycles, but as a png with a transparent background. Without a transparent background, the output image looks like this: But as soon as I tick the "Transparent" ...
9
votes
1answer
8k views

How can you make the mesh in a 3D view a bit transparent?

I'm modelling with a reference image as a background image, but I can't see it through the mesh. How can I make it a bit transparent in the 3D view so I can see the image? NOTE: I'm doing this in ...
9
votes
1answer
4k views

Setup a decal material in cycles [duplicate]

I'm trying to setup a image decal in cycles, and I can't figure how to setup the nodes to work fine. Does anyone know the solution? blendFile
9
votes
2answers
1k views

Can we render a sky layer with transparent layers?

I am using a transparent alpha in the shading menu, while rendering my layers, so I can later composite them together. Question is, is there something like a sky ...
9
votes
1answer
2k views

Adaptative ray bounces in Cycles

Sometimes, in order to avoid noise and render faster, I set the bounces to 0. The problem is that I don't get any reflection on water, glass, etc. I know that some nodes provide tests to stop a ray (...
9
votes
2answers
354 views

Compositing Layers Have Halos

I'm having a heck of a time compositing numerous layers using the Alpha Over nodes in the compositor. I have done this many times before without a problem. All the objects on each layer are ending ...
8
votes
1answer
19k 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?
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, ...
8
votes
2answers
23k views

How should a glass material be setup in Cycles?

A glass-shader produces a render like this: Adding a transparent shader creates Where does the border labeled as 1 come from? Why is the outer region (2) more translucent than transparent? Not ...
8
votes
1answer
19k views

Texture mapping with multiple UV maps

So, as a newbie relatively new to blender, I started doing some texture mapping (blender internal Render). I created a texture for the main object and a couple of transparent decals to decorate it. (...
8
votes
1answer
867 views

Animate alpha in Cycles nodes

I'm making a shader that combines two image textures based on the alpha channel of the texture on top. Now I need a way to adjust and animate what comes from the alpha-output of the texture node and ...
8
votes
1answer
2k views

Having problems making transparent plastic in Blender cycles

I have been trying to make transparent plastic that looks like this: But this is the closest I could get to it and I been trying for a while So I would like help with what I should try to do
8
votes
3answers
11k views

Opacity of an object in 2.8

I am trying to change the opacity or alpha of an object so its see-through in 2.8. How do I do this? I can't seem to get to figure out how in 2.8. Example of what I am trying to do is below.
8
votes
3answers
1k views

Light path Transparent/Diffuse Depth

I'm working on a cycles shader that requires thickness information, and by that I mean interaction between the mesh with the shader itself and other objects inside it, in a way that as closer a ...
8
votes
1answer
2k views

Rendering fire animations with transparent background

I'm creating a simple fireball sprite for my game and I want to render a fire animation. I would like to get the upper images with transparent background, but when is set the transparency on under ...
8
votes
1answer
3k views

Can Blender take two video files and overlay them with transparency?

Can Blender take two video files and overlay them with transparency? Essentially I want to have a video sequence playing while a 2nd sequence is overlayed and also playing, but that 2nd sequence is ...
7
votes
1answer
43k views

How to render transparent textures in blender render?

I've managed to make the background of the image transparent, but I can't work out how to render the transparent textures on the leaves as transparent and not opaque. How do you do this? here's a ...
7
votes
1answer
3k views

Transparent textures that allow light to shine through

I was wondering if there is a way to edit a png texture to allow light to shine through its alpha channel. As though the transparent alpha not actually present in 3D space to block the light. I am ...
7
votes
2answers
793 views

Why should I never ever use “Convert Premul” on Cycles renders?

On this question, When trying to overlay images using Alpha Over for green screen work , I used premultiply Alpha, it was the only option that would give me clean key without the background bleeding ...
7
votes
1answer
995 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 ...