Computer Graphics Stack Exchange Community Digest

Top new questions this week:

Inspecting gltf animation data

I am trying to load gltf data onto an engine I am making and I am noticing that something is wrong with the rotations. I want to be able to see the raw numeric values of the animation data in the gltf …

mesh animation gltf

asked by Makogan Score of 2 answered by emackey Score of 2

How to apply a linear transformation to gltf data

One thing that is mathematically sound is to grab a gltf model and apply some arbitrary linear transformation to it, like a rotation or a translation. Let’s say the transformation is encoded as a 4×4 …

transformations animation model gltf

asked by Makogan Score of 1 answered by pmw1234 Score of 1

Compute shader in DirextX: difference between four kinds of memory barriers

There are four kinds of memory barriers in DirectX. Their names and definitions are: DeviceMemoryBarrier: Blocks execution of all threads in a group until all …

compute-shader directx synchronization

asked by Fan Score of 1

How to add HemisphereLight to a simple threejs scene?

I’m trying to add light and see its changes in a simple scene in threejs but no matter the intensity or the color I set for the light, I see no change in a scene. Actually, if I don’t include the …

lighting color vector-graphics javascript three.js

asked by Jonas Score of 1

Greatest hits from previous weeks:

What is ambient lighting?

Wikipedia says: An ambient light source represents a fixed-intensity and fixed-color light source that affects all objects in the scene equally. By saying “affects all objects equally” they mean …

lighting

asked by Joey Score of 11 answered by Julien Guertault Score of 13

OpenCL doesn't detect GPU

I installed AMD APP SDK and here my problem. The OpenCL samples do not detect the GPU. HelloWorld give me this: …

gpu opencl

asked by Thomas BRAUD Score of 6 answered by Tyler Parker Score of 3

Physically based shading – ambient/indirect lighting

I implemented a physically based path tracer after studying PBRT by M. Pharr and G. Humphreys. Now I’m trying to apply physically based rendering to real time graphics using OpenGL ES (in an iPhone …

real-time physically-based shading opengl-es

asked by Fabrizio Duroni Score of 18 answered by Nathan Reed Score of 47

When is a compute shader more efficient than a pixel shader for image filtering?

Image filtering operations such as blurs, SSAO, bloom and so forth are usually done using pixel shaders and “gather” operations, where each pixel shader invocation issues a number of texture fetches …

performance rendering compute-shader pixel-shader

asked by Nathan Reed Score of 56 answered by John Calsbeek Score of 32

A recent approach for subsurface scattering

I read “A Practical Model for Subsurface Light Transport” and “A Rapid Hierarchical Rendering Technique for Translucent Materials”. If I understand correctly, the former does not consider the case …

raytracing pathtracing global-illumination subsurface-scattering cuda

asked by Mustafa Işık Score of 9 answered by RichieSams Score of 10

How is Gaussian Blur Implemented?

I’ve read that blur is done in real time graphics by doing it on one axis and then the other. I’ve done a bit of convolution in 1D in the past but I am not super comfortable with it, nor know what to …

image-processing gaussian-blur

asked by Alan Wolfe Score of 50 answered by Bert Score of 54

What does “makeContextCurrent” do exactly?

I am pretty confused about that function. GLFW Context reference says as follow: This function makes the OpenGL or OpenGL ES context of the specified window current on the calling thread. A …

opengl c++

asked by Adrian Score of 17 answered by user1118321 Score of 28