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I just released a new app that lets you calibrate your turntable simply by playing a song! 🎶
It's called Grooved, it's 100% free, and contains no ads or trackers.
You can try it out here: https://grooved.okat.best
I started adding "Uneducated guesses" to my Radar reports in addition to repro steps and expected/actual behaviour.
I just take a stab at what I think is going wrong under the hood, not only to force myself to think through the problem but hopefully to also make my tickets easy to pick up and fix.
Oh and if you work at Apple: FB13216451 😁
Finally, the model is colored using a gradient map and triplanar-mapped detail, normal, and roughness maps are applied.
I have posted before about the process to get vertext color working properly in Reality Composer Pro.
The is one single model, and the resizing is done in a vertex shader. Geometry color drives how much part of the model needs to be pulled or pushed in each direction.
Features don’t have to be static size, they can also grow faster or smaller than the rest of the model.
Dynamic non-uniform 3D model box resizing.
The box can be any size, but some of the features (such as the label or the tape) remain in the right spot and at the right size.
I was having some issues with clipped content in RealityKit, so I made a class to visualize its bounds: https://github.com/IvanMathy/RealityBounds
Continuing the vertex color journey, it turns out Blender exports Vertex Color as sRGB when using usdx files. It seems to ignore the project's settings.
This is important when using the vertex color not as just a color, but as input for calculation. `0.5` becomes `0.21404096`.
This can be easily brought back by raising the values to`^(1/2.224)`.
I know it's not on Apple to fix but I opened a Radar to request color space conversion nodes as it could be helpful: FB13095647
Heard back from Apple on my radar, turns out the attribute (primvar) needs to be called `displayColor`. Easy fix, and now I have vertex color in my shader graph!
I wasn't far off, but I don't think I would have ever figured it out myself. This string does not appear anywhere in their MaterialX fork nor in the USD spec... Not sure where it comes from, but I'm glad to know what it is! I'm still not able to get Primvar readers working unfortunately.
Drew Olbrich