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61315 / gltf-mac

A library for loading glTF 2.0 assets into iOS runtime.
MIT License
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Channel extraction #2

Closed 61315 closed 3 years ago

61315 commented 3 years ago

This PR fixes #1.

Codes related to channel masking are purged, since tinkering with textureComponents provides better option for channel masking in both resource/computation-wise ways.

Notice the textureComponents property explicitly requires iOS 11.0 and above.

Availability of textureComponents

See: https://stackoverflow.com/a/40058657/13863074 See: https://developer.apple.com/documentation/scenekit/scnmaterialproperty/2865880-texturecomponents?language=objc

https://user-images.githubusercontent.com/46559594/115949243-a4ec3200-a50e-11eb-8f0c-39a0fdc0cecb.mp4

61315 commented 3 years ago

We really need to test occlusionMetallicRoughness texture, Corset.glb for example.

channel texture
red occlusion
green roughness
blue metallic

Screenshot_2021-04-24 Babylon js - Corset glb

61315 commented 3 years ago

Webp net-resizeimage(1)

<SCNMaterial: 0x10300bd00 'Corset_O'
  diffuse=<SCNMaterialProperty: 0x283935200 | contents=<CGImage 0x10300c540> (IP)
    <<CGColorSpace 0x28332c0c0> (kCGColorSpaceICCBased; kCGColorSpaceModelRGB; sRGB IEC61966-2.1)>
        width = 2048, height = 2048, bpc = 8, bpp = 32, row bytes = 8192 
        kCGImageAlphaNoneSkipLast | 0 (default byte order)  | kCGImagePixelFormatPacked 
        is mask? No, has masking color? No, has soft mask? No, has matte? No, should interpolate? Yes>
  normal=<SCNMaterialProperty: 0x283935480 | contents=<CGImage 0x10300dcd0> (IP)
    <<CGColorSpace 0x28332c0c0> (kCGColorSpaceICCBased; kCGColorSpaceModelRGB; sRGB IEC61966-2.1)>
        width = 2048, height = 2048, bpc = 8, bpp = 32, row bytes = 8192 
        kCGImageAlphaNoneSkipLast | 0 (default byte order)  | kCGImagePixelFormatPacked 
        is mask? No, has masking color? No, has soft mask? No, has matte? No, should interpolate? Yes>
  ambientOcclusion=<SCNMaterialProperty: 0x283935580 | contents=<CGImage 0x10300d190> (IP)
    <<CGColorSpace 0x28332c0c0> (kCGColorSpaceICCBased; kCGColorSpaceModelRGB; sRGB IEC61966-2.1)>
        width = 2048, height = 2048, bpc = 8, bpp = 32, row bytes = 8192 
        kCGImageAlphaNoneSkipLast | 0 (default byte order)  | kCGImagePixelFormatPacked 
        is mask? No, has masking color? No, has soft mask? No, has matte? No, should interpolate? Yes>
  metalness=<SCNMaterialProperty: 0x283935300 | contents=<CGImage 0x10300d190> (IP)
    <<CGColorSpace 0x28332c0c0> (kCGColorSpaceICCBased; kCGColorSpaceModelRGB; sRGB IEC61966-2.1)>
        width = 2048, height = 2048, bpc = 8, bpp = 32, row bytes = 8192 
        kCGImageAlphaNoneSkipLast | 0 (default byte order)  | kCGImagePixelFormatPacked 
        is mask? No, has masking color? No, has soft mask? No, has matte? No, should interpolate? Yes>
  roughness=<SCNMaterialProperty: 0x283935400 | contents=<CGImage 0x10300d190> (IP)
    <<CGColorSpace 0x28332c0c0> (kCGColorSpaceICCBased; kCGColorSpaceModelRGB; sRGB IEC61966-2.1)>
        width = 2048, height = 2048, bpc = 8, bpp = 32, row bytes = 8192 
        kCGImageAlphaNoneSkipLast | 0 (default byte order)  | kCGImagePixelFormatPacked 
        is mask? No, has masking color? No, has soft mask? No, has matte? No, should interpolate? Yes>
>

Our ambientOcclusion, metalness and roughness properties all point to same CGImageRef, which is correct.