Questions tagged [light]

Questions about light, lamps, lighting and lighting issues.

Filter by
Sorted by
Tagged with
6
votes
1answer
3k views

how can I make an emission shader shine through a transparent material?

I am trying to use the emission shader to make a light, but I realized that it seems to be only shining through to a limited extent: These are the nodes for the light: These are the nodes for the ...
3
votes
2answers
2k views

Jagged and wrong looking shadow on hair particles

The shadow on my smooth shaded sphere with hair particles just looks wrong: Blender scene with wrong shadow I use Blender version 2.69, normals are turned outside and there are no doubled vertices. ...
1
vote
1answer
285 views

Why do my spotlight's dimensions differ between rendered and non-rendered view?

In an animation scene of mine, I render most of the scene in Cycles and only the volumetric light in BI using a fully linked copy of the original scene where only the layer with the spotlight is ...
6
votes
1answer
6k views

How do I properly set up a spotlight cone?

I'm having a problem while rendering a searchlight-style spot lamp (i.e. I want to see the "light cone" in the final render ("Halo" option is checked), a.k.a. volumetric light). It appears that the ...
11
votes
1answer
1k views

Per-Vertex lighting in GLSL?

How can I achieve per-vertex lighting (like in single/multi-texture shading) in GLSL with all of the other GLSL features (like buffer shadows, texture layers, etc.)? Bonus points if it can be done in ...
5
votes
1answer
124 views

Have two lamps blend together to give another color on a face

I am working through Blender 3d Basics by Gordon C Fisher. I'm on page 72. I have a green light and a red light but no yellow as pictured. Can anyone explain what I am doing wrong? Or better, What to ...
10
votes
2answers
11k views

Not render sky texture?

I'm using a sky texture for environmental lightning. It gets rendered as background when I do that. Can I prevent it from rendering, but still use it for environmental lightning?
7
votes
3answers
2k views

How are cycles lamp types different?

I have noticed that some lamp types result in less noise than others. For example, a point lamp gives less noise than a mesh lamp (rendered at 10 samples): Here is the blendfile used for this test. ...
15
votes
1answer
9k views

Where does light come from in a Cycles scene without lamps?

Using the Blender Render, if you have no lamps, the objects are black. With Cycles Render, even without any lamps, there is a small amount of light. Here is a render of the same yellow monkey ...
6
votes
1answer
2k views

Realistic Outdoor Lighting in Cycles [closed]

I'm interested in architectural illustration and always find it hard to get a realistic outdoor lighting (shinny/cloudy). Can you provide settings/tutorials for that?
14
votes
3answers
16k views

What does the Roughness setting on a diffuse shader do?

What does the Roughness setting value in a Diffuse shader actually do? The wiki says: Surface roughness; 0.0 gives standard Lambertian reflection, higher values activate the Oren-Nayar BSDF. But ...
15
votes
5answers
3k views

What is the technical difference between a diffuse shader and a rough glossy shader?

If I understand correctly, the roughness value on the glossy shader controls the amount of random scattering of rays that reflect of the surface of the object, with ...
16
votes
2answers
14k views

How to create a visible material that does not emit or reflect light?

I need to make a plane in the background that is independent of any lighting in the scene. This means that it does not emit light, and it does not reflect light, but it is visible. It is so I can ...
7
votes
2answers
1k views

Can I make smoke to cast light?

Is there any way to cause (or fake) light emission from the fire within a smoke simulation? Obviously smoke doesn't work in Cycles but is it possible in BI for the flames to contribute light to the ...
8
votes
1answer
616 views

Can I use BSDF for the emission pattern of a lamp or light source?

I started to study blender because I want to perform some simulations on bicycle lighting. My goal is to take a picture of a beam pattern against a wall, then use it as the Bidirectional EMISSION ...
2
votes
2answers
3k views

Is it possible to simulate Fluorescence in cycles?

It it possible to create a fluorescence shader in cycles? From Wikipedia: Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation. More ...
10
votes
1answer
5k views

How do you make a lamp light up glossy surfaces?

Working on a candle project to practice: Under the 'world' properties I have turned the strength down to 0 (thus making it pitch black). I then added a lamp to the workspace and adjust its strength ...
4
votes
1answer
686 views

Transparent laser focus

Did I understand the answer in this post correctly? It says that due to the fact that volumetric lighting is not implemented yet, creating a transparent laser focus with visible molecular spheres in ...
6
votes
1answer
2k views

Look through Spot Light

I have a spot light in my scene and I want to accurately place it. I know there was a way to do this in 2.55, but that doesn't seem to work anymore. How can I look through my light?
3
votes
1answer
402 views

Dark surface unchanged by light source changes

I have 3 lamps on the scene (the one on the left has 0 energy): The rendered surfaces are supposed to look like shiny metal. However, there's always a dark spot at the top of the large light orange ...
12
votes
3answers
9k views

Is it possible for a emission shader not to cast shadows?

Is there an option, like on lights sources, to tell the object that has an emission shader to not cast shadows in the scene?
6
votes
1answer
1k views

Difference between the scale and the size of a light in cycles?

To adjust the shape of area light in cycles, there is the Scale, or there is size in the light properties. What is the best way?
13
votes
3answers
11k views

Creating volumetric lighting (crepuscular rays) in Cycles

Crepuscular rays (a.k.a. "god rays" and many other names) can be created in Blender Internal by checking the Halo checkbox in the lamp properties box. How can I create a similar effect using Cycles?
7
votes
2answers
9k views

How to Bake Lights

How does one bake lights and only the lights (no textures, shadows, etc.) in Blender 2.67b? I don't see anything that would indicate as to baking lights within the Bake Mode.
5
votes
1answer
206 views

Polygonal darkness appearing in render

I am following this BlenderGuru tutorial on making an asteroid and when it comes to rendering the scene I get an unwanted "shadow". The shadow starts to appear in frame 36 of the render (but is ...
10
votes
3answers
2k views

Reducing the size of shadows

I am looking to reduce the size of the shadow being cast on the mesh in the background.. I have only one light which is a sun lamp with ray shadow on, the mesh i have receive, receive transparent and ...
13
votes
1answer
3k views

Is it possible for light sources in Cycles to have nonphysical falloff like in BI?

In BI, we have the traditional OpenGL choices of constant, linear and 1⁄distance2 falloff, along with some parameters to tweak the falloff formula. This allowed for a variety of artistic styles,...
8
votes
1answer
5k views

Material that emits light, but appears diffuse?

How can I have an object that emits light (using an emission shader) onto other objects, but when rendered appears to be diffuse (or any other shader for that matter)? In essence, I want one object ...
10
votes
2answers
1k views

Altering size of emission object without messing up brightness of light in scene

To create a light source using Cycles, I create a plane (or other mesh shape) and set the strength until it looks good. When I scale that light source, say make it three times bigger, the total ...
10
votes
2answers
7k views

How to make lamp visible to camera in cycles?

How can I make the lamps (area/point/spot) visible to camera in Cycles render? Currently they are invisible to the camera, unlike custom mesh lights which can be seen unless camera visibility turned ...
41
votes
3answers
16k views

Iridescence In Cycles?

Is it possible to create an iridescence shader in Cycles? Specifically for something like DVDs, soap bubbles, engine oil, etc.. I know about this technique for a DVD material, but it doesn't properly ...
29
votes
2answers
20k views

Light spectrum dispersion effect in Blender?

I'm trying to achieve the effect where a beam of light sent through a prism or other refractive object, separates out into the light spectrum. (See image below) This effect is especially useful to ...
4
votes
1answer
245 views

Shadows distorted and enlarged upon rendering

When I render the scene, the shadows of the fish have become distorted and enlarged. I have played around with the shadow settings on the meshes, materials, textures and environment but cannot fix the ...
53
votes
3answers
23k views

Making a Laser in Cycles - Straight Beam of Light?

I am modeling a laser pointer in Blender, but I am not sure how to make the laser's light beam. The Spot light comes the closest to what I am looking for, but its starting diameter is 0, and you ...
7
votes
4answers
35k views

How do you keep a single object from casting a shadow?

Is there a way to prevent a single object from casting shadows? If I shut down "Cast Shadows" on the light source then all shadows will be lost. That is not what I want. I want to be able to prevent a ...
10
votes
3answers
1k views

How to capture lighting in video shots?

How do I best capture the lighting in a video shot so I can easily insert rendered objects into the scene that are correctly lit?
10
votes
2answers
4k views

Light reflection and refraction in Blender Internal?

I have noticed when trying to make a mirror in Blender that it does not reflect light onto other objects properly. Also, it seems that setting the IOR (Index of Refraction) for transparent objects ...
14
votes
2answers
9k views

What are the differences between lamps in Cycles and Blender Internal?

I've noticed that if I have an existing scene setup for Blender Internal and I switch to cycles, the lighting is completely off. I sometimes have had to start a new scene and import the models I want ...
9
votes
1answer
512 views

How do I control refractive properties realistically?

I know a bit about controlling dispersion, but I am interested in learning how to use IOR (index of refraction) to mimic specific materials, like a sodium-rich glass. What is the best way to ...
20
votes
2answers
2k views

Does Cycles work with wave optics?

You know how raytracers pretty much just trace geometrical rays? I was wondering if Cycles has any wave optic features, where it would act as an actual electro-magnetic wave. Some really useful ...

1
23 24 25 26
27