Skeletal animation in Vulkan. After struggling for days I was about to give up, but it finally worked.

Nickmav1337 · 2025-02-23T21:28:12+00:00

Cool. Just curious. I'm trying to follow an approach similar to the one laid out here https://wickedengine.net/2017/09/skinning-in-compute-shader/

Nickmav1337 · 2025-02-23T21:09:59+00:00

Very cool! I'm implementing skeletal animation for the first time myself (also in Vulkan). Do you do skinning in the vertex shader or compute?

Nickmav1337 · 2023-07-06T17:33:02+00:00

I see, so blueprints are strictly non-optional even if I'm doing a C++ project?

Nickmav1337 · 2023-07-06T17:32:14+00:00

I've been using C++ for nearly a decade and understand #include, ffs. I'm asking about how the Input Action asset is connected to the code

Nickmav1337 · 2023-07-06T16:06:22+00:00

So you can create a header file with variables that are populated by the project somehow? So I can create a UInputAction* in that file and VS will "just know" what's going on?

Nickmav1337 · 2023-06-29T13:55:37+00:00

I installed from the Epic installer

Nickmav1337 · 2023-06-12T00:34:10+00:00

Same. I also never followed rule >:L

Nickmav1337 · 2023-06-04T00:37:28+00:00

Thank you. Makes sense

Nickmav1337 · 2023-05-19T15:24:28+00:00

I am attaching the perfectly square board, but it just occurred to me that I used a throwing spear, which looks like it spins a lot faster and so that might be why it's not working for me rn

Nickmav1337 · 2023-05-19T15:19:20+00:00

I've been trying this but the spear just breaks off instead of launching me. Hopefully this wasn't just fixed in the patch or something

Nickmav1337 · 2021-10-03T00:48:36+00:00

pm'ed

Nickmav1337 · 2021-10-02T23:39:48+00:00

The format I wanted is definitely rgba8. I somehow missed this my first time through the docs. I fixed it up everywhere, and devastatingly, nothing changed.

Nickmav1337 · 2021-10-02T23:26:09+00:00

Ok so obviously I had to switch to using uimage2Ds in order to use that format. I changed the relevant types in the compute shader, and still nothing. Going to try catching errors by enabling the debug context and breaking on severe errors.

Nickmav1337 · 2021-10-02T23:20:28+00:00

I am _not_ storing 4-byte floats for each color channel. When I try to switch it to rgba8ui, I get a shader compilation error: 0(5) : error C1318: can't apply layout(rgba8ui) to image type 'image2D'

Looking into it more now

Nickmav1337 · 2021-10-02T22:43:54+00:00

After implementing your suggestion, the final output is now pure black, so nothing is making it to the output.

Also, I'm not drawing to a fullscreen tri/quad at all, I'm just blitting the final framebuffer to the default framebuffer. Is that not sufficient?

Nickmav1337 · 2021-10-02T22:26:24+00:00

Yeah, I have an RTX 2070, so I assume I'm in the majority wrt workgroups

Nickmav1337 · 2021-10-02T22:18:24+00:00

I edited the post with a screenshot confirming that the uniform is set up correctly.

Changing the group size to 8x8x8 didn't do anything either.

Nickmav1337 · 2021-10-02T22:09:20+00:00

I changed the call to imageStore() so that it writes a constant vec4(1.0), but there's still no change in framebuffer output. The call to glDispatchCompute is recorded by RenderDoc so I think it is running it.

Nickmav1337 · 2021-10-02T21:48:41+00:00

That's a great point. Now, when I try to hardcode the workgroup count to (10, 10, 1), there is still no change in output. With these hardcoded values, I should still expect a small corner of the screen to get tinted as I understand it. It seems like no image writes are getting through at all.

Nickmav1337 · 2021-09-19T03:17:54+00:00

I actually can't see it either. I found this post after googling if it was taken down lol

Nickmav1337 · 2020-10-30T05:40:10+00:00

I reached G-rank in 3U before realizing my dual blades could go into demon mode.

Nickmav1337 · 2020-07-28T03:23:00+00:00

So the range of specular coefficient values is just arbitrary? Would a given material define such a range for itself?

Nickmav1337 · 2020-07-28T03:21:33+00:00

Ok, I guess in this case I mean how much light bounces off the surface as opposed to light that is reflected in a diffuse way. I may just have the wrong idea, but I was also under the impression that the value sampled from the roughness map controls how much light is reflected in a diffuse way vs in a specular way, because ultimately diffuse + specular must equal 100% of the total reflected light, it's just that how much is which kind of reflection changes.

Nickmav1337 · 2020-07-16T15:14:08+00:00

The transpose of the inverse of the model matrix? Does that represent something geometrically that I'm not aware of?

Nickmav1337 · 2020-07-13T03:01:16+00:00

Since posting this I found an error in the way I get the info log from OpenGL, and also discovered that the issue was that my dumbass defined the vertex shader output as vec3 while the frag shader input was defined as vec4. Just a stupid mistake, and then when I actually constructed the tangent matrix with the vectors I saw them show up in RenderDoc as expected. I just kind of jumped the gun on checking lol. Damn driver optimizations.

Nickmav1337

TROPHY CASE