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Questions tagged [raytracing]

Ray tracing is a rendering technique for generating a 2D image by tracing the path of light as pixels in an image plane and simulating the effects of its encounters with virtual objects.

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Retrieve Ray Tracer data

I need to be able to, given a scene in Cycles, extract the values of direct lighting intensity and angle of incidence for every light ray that hits a mesh. The final goal is to use these values to ...
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Adding to sketches

I am new to Blender. I have been able to trace an image, but cannot add the details with color, such as eyes. When I move the eyes to figure but the color does not show up. How do I keep the color ...
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intensity color with custom ray tracing

I want to change how light is calculated. Therefore I need my own raytracer. How do I write my own simple raytracer using python? Answering my own question. Will happily accept improvements & ...
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86 views

How to visualize reflection of a beam or ray

I need to know how light is reflected on the objects given a fixed spot as light source. The best way would be to render a laser beam, however such laser beam is not easy to design/render and heavily ...
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Blender for competition? [closed]

I am in a competition. I am literally 2 weeks into game dev, and rarely use Blender. I normally just use it for a brief tutorial, and if it works, it works, if not, I just forget about. So the ...
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Flickering Shadows while rendering animation

I'm complete beginner to Blender(using v.2.78). While rendering animation scene with camera movement, the shadows are flickering and most importantly the shadows are completely gone after 10 frames. I ...
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54 views

How to avoid weird artifacts which only appear with ray-tracing enabled with Blender Render?

What's the cause of the weird, checkerboarding on the purple spheres and how do I remove it?
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Can I use an Environment Texture to bake a skybox from a 3D environment in 2.8?

I'm looking to see if there's a faster, better way to make a skymap/cubemap for a game (Unity) using baking and / or Environment Textures. Ideally, this should be faster than this method (or similar)....
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Raycast hit problem.

I'm using the raycast function to get the location of the hit of each ray onto an object. My problem is that the ray doesn't stop on the first hit on the surface of the model, it keeps going to until ...
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2answers
87 views

How to distribute light equally on a surface?

I have the following setup: The black rectangle is my light source, the gray panel is the rendered panel. How can I distribute the light in an equal mode on the panel? I'm using Cycles in Blender 2....
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2answers
4k views

Will EEVEE be able to do real time ray tracing? [closed]

I heard about NVIDIA's announcement about real-time ray tracing - I want to know, will Blender support this in the future? That is, will you be able to see things real-time ray traced (that is to say, ...
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Associating extra information to a ray in Cycles

Maxwell Render has a feature called Multilight, where the integrator keeps track of which emitter contributed how much to the scene, so that lights can be dimmed or brightened without re-rendering. As ...
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749 views

Boolean on cycles rays, not on mesh

Given a scene with objects and light sources, I want to add a box somewhere in the scene that surrounds some objects and collisions with some others. A camera looks at the box from outside. Now I ...
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1answer
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What is a shadow ray?

I have read the Blender documentation wikis on both the light path node and on light paths. But neither of them seems to clearly explain what a shadow ray is. For instance, the light paths wiki says:...
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1answer
1k views

Cycles light ray exiting the back of an object

Is it possible in a Cycles material node setup to get when a light ray is exiting an object? Use case: I'm using a Fresnel input to mix transparent and diffuse shaders. I want to see into the object, ...
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What is branched path tracing and how is it useful?

I noticed recently that there is a new option in Cycles for "branched path tracing", can someone explain what this does in easy to understand terms? Should we expect faster render times or less ...
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Why can't cycles cast one ray per image pixel, instead of rendering progressively to infinity?

I am wondering why Cycles renders progressively to infinity. Why is it not possible to do one ray per pixel in the image, letting you have a finished result with ...
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1answer
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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 (...