Questions tagged [light]

Questions about light, lamps, lighting and lighting issues.

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58
votes
2answers
24k views

Creating a Black Hole in Blender

I recently saw the film Interstellar and it was fantastic! The effects blew me away and it got me in the mood to try and re create the black hole, however I haven't been able to find any information ...
53
votes
3answers
24k 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 ...
41
votes
3answers
17k 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 ...
38
votes
3answers
47k views

How to make a cycles light emisson object invisible to the camera?

In my scene it is required to position the lights close to the main object like this: How I can make the light source invisible to the camera?
31
votes
1answer
35k views

How to make mesh lights work in Blender Eevee?

The closest I can get to making mesh lights affect their environment in Blender Eevee is giving them an Emission material and turning on "Bloom". But this isn't emitting proper light, it just looks ...
30
votes
2answers
21k 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 ...
29
votes
1answer
7k views

How do I emit light from inside a object?

I need to know how to make the buttons in my blender project look the same as in this photo. Mine all look pale, even with the emission material. Is there anyway I can get my buttons like this?
27
votes
1answer
4k views

How can I create Light Streaks in Cycles?

I'm trying to make a light paths like there: To achieve this light threads (streaks) I used a particles emmiter with shining icospheres and motion blur shutter like Andrew. I got this result: First ...
23
votes
4answers
10k views

Area Light vs. Emissive Polygon

Both an area light and an emissive polygon can be used to create lights. What is the difference between the two?
22
votes
1answer
41k views

Can anyone give me some tips on Lighting in Cycles?

I am using the Cycles render engine. I love the ability to use my GPU for rendering, and I have achieved some nice results texture-wise, but I am having a hard time with lighting. One problem in ...
21
votes
2answers
2k views

Volumetric Windows 10 logo effect

I'm trying to recreate the windows 10 background effect on a logo I've made in blender. Half the logo has a glass like material, the other half has a steel like material. And I'm using cycles at the ...
21
votes
2answers
6k views

Light-bulb Filaments: Brightness and Internal Reflections in Cycles

I'm working on making an "Edison bulb" for part of a photo-realistic scene. The filament is composed of extrusions of a very small cylinder (if that's a poor method, please correct me; I'm very new ...
20
votes
3answers
8k views

Meaning of Sun Lamp Size?

In Cycles, a sun lamp is treated as infinitely far away - only the angle matters, not the position. Other lamps have their sizes defined in blender units: a point lamp with size 1 emits light from a ...
20
votes
7answers
24k views

How can I cast artificially darker shadows?

I want to make certain shadows more prominent (using Cycles) without further illuminating the rest of the scene. Example: I have a simple studio with a bowl of fruit and 3-point lighting. The light ...
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 ...
19
votes
2answers
2k views

How to measure the dynamic range of an HDRi?

In this question the issue of photorealistic images and the need of a Wide Dynamic Range is discussed. Rendering with a wider dynamic range to produce photorealistic looking images will need high ...
19
votes
1answer
12k views

Using volumetrics in Cycles I have to have the light strength super high

I have to have a spot lamp strength VERY VERY high to have these light rays come through 300000.0 and look good. Sounds crazy doesn't it. Maybe it doesn't matter but it doesn't feel right. Will I ...
17
votes
1answer
8k views

How do the new light probes in Eevee work?

I've been experimenting with Blender's new Eevee engine over the past couple of days and, so far, have failed to get the realistic results I'm aiming for. I've seen some online tutorials and articles ...
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 ...
16
votes
3answers
4k views

reflecting direct light on glossy surface in Cycles

Working in Cycles. Say I have a "disco ball" with a glossy shader. I'm pointing a spot light to it, and I'm trying to have the reflections of that light illuminate the diffuse material on the walls ...
15
votes
2answers
15k 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
10k views

How to create an array of lamps?

Following this question. Since you can't use an array modifier on lamps, how can you create an array so that all lights are clones of the same original and can be edited as one?
15
votes
1answer
5k views

What kind of units does the Cycles emission strength use?

I understand that the emission shader strength value is Watt/m^2. However, I haven't been able to find any documentation stating what type of light source this ...
15
votes
1answer
2k views

What is vertex and edge shading?

I know how shading works with faces: That's set by choosing Smooth/Flat under Faces in the Shading menu: But what do the other two options—Edges and Vertices—do?
15
votes
1answer
10k 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 ...
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 ...
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 ...
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 ...
14
votes
1answer
5k views

How to make a heat distortion effect?

How can I make a heat distortion effect, like you might see around the exhaust of a jet engine?
14
votes
1answer
2k views

Using Nodes for Laser Line

I am currently trying to recreate the laser line described in Making a Laser in Cycles - Straight Beam of Light? I have selected the Cycles Renderer, enabled nodes on my light (spot and point tested)...
14
votes
3answers
10k views

What does Light Portal mean?

I've heard a lot about this 'cool' feature in the next release and I wonder what it is. Any infos?
14
votes
1answer
1k views

Spotlight with Halo applied is creating rings around light

Here's a portion of a render I'm working on, which is backlit from behind by a spotlight with a "Halo" effect applied: If you look carefully in the background, you'll notice the halo effect is ...
14
votes
1answer
20k views

Is there a textured but unlit (full bright) viewport mode?

I'm trying to display models that have shading drawn or baked directly on the textures, but I can't figure out how to disable Blender's default scene lighting. If there are no lights in the scene, ...
14
votes
1answer
2k views

How to project an image from a Cycle's Sun light

I'm trying to project a caustics texture from a light in Cycles. It works with Point or Spot lights, but I'm trying to emulate the sun projecting caustics underwater, so I need the shadows and light ...
13
votes
2answers
4k views

How to make small objects emit a ton of light?

So, I'm trying to create a chemical plant model, and you know how when you drive past an oil refinery at night it's all lit up with dozens of lights and it looks really cool? That's what I'm going ...
13
votes
2answers
3k views

How to make Shadows-Only Render

How can I achieve the following effect? Here, we see all shadows, and nothing else.
13
votes
2answers
21k views

How to make sunbeams in blender?

I was working on a something and I thought, wouldn't sunbeams look great with this. So I searched in google and everywhere but didn't find any answer. So my question is how to make sunbeams in blender?...
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?
13
votes
1answer
1k views

How would you model 'a sphere with a shell' like object?

I am trying to model this thing, but the silver cover on top is what I have no idea how to go about. And the blue-ish reflection I believe is from the sphere being cast on the inner side of the ...
13
votes
3answers
204 views

Make light visible once it passed through a transparent object

I am looking for a better solution to make light in Cycles only visible, once it passed through a transparent object. Example which is actually pretty close but has a few flaws, see below A doorframe ...
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,...
13
votes
1answer
37k views

I can't find where to change the strength of the sun in version 2.70a

I have viewed the tutorials of lighting and shading, but the version used in the tutorials must be older than that I use.
12
votes
3answers
6k views

Correct vector input to map texture light in Cycles

What is the correct vector input for a texture connected to a Cycles lamp so that I can make a projector-like textured light? I am trying to make an projector-like effect with a textured light in ...
12
votes
3answers
10k 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?
12
votes
2answers
3k views

Transparent blue plastic material which emits light

Hi I am creating a Doctor who Sonic screwdriver model in Blender and am having difficulties creating the material for the blue light on the end. Preferably I'd like one material which emits light and ...
12
votes
1answer
11k views

How to animate light's energy

I'm new to animation with blender, I can animate the rotation, position and scale of a light, but not the energy that it emits. Can anyone tell me how to animate the Energy value?
12
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 ...
11
votes
1answer
24k views

How to render an object without its shadow?

I am trying to delete the shadow from the heart but I can't:
11
votes
2answers
490 views

Create a working microscope in Blender?

I am modeling a microscope, and am wondering if it is actually possible to make the microscope would so that it functions like a light-refractory microscope in real life. (Not an electron scanning ...
11
votes
1answer
575 views

How can I make light that changes its color with path length?

I want to create a light source whose light colour will change with ray length. Example: ...

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