What you are doing wrong is saving to tga
It's probably not a bug. It looks like what we are seeing is not the high poly wireframe but quantization banding artefacts : the tga file format can at most save to 8 bits per channel whereas in psd we can save to 16 bpc.
The best thing that could be done against this, bar using 16bpc, is to add dithering when saving to 8bpc, which we'll add in the next minor release of Designer, but that's not a magical solution either because it adds noise.
PS : to be 100% accurate, in the case above, you probably have computed the curvature based on the low poly and a baked normal map. That's actually the normal map that should be saved to 16bpc. It's likely that 8bpc is sufficient for the final curvature though.
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It's probably not a bug. It looks like what we are seeing is not the high poly wireframe but quantization banding artefacts : the tga file format can at most save to 8 bits per channel whereas in psd we can save to 16 bpc.
The best thing that could be done against this, bar using 16bpc, is to add dithering when saving to 8bpc, which we'll add in the next minor release of Designer, but that's not a magical solution either because it adds noise.
PS : to be 100% accurate, in the case above, you probably have computed the curvature based on the low poly and a baked normal map. That's actually the normal map that should be saved to 16bpc. It's likely that 8bpc is sufficient for the final curvature though.