USD Import: No texture coordinates imported #93052

New Issue

Steffen Hauser · 2021-11-13T11:36:03+01:00

Steffen Hauser commented

2021-11-13 11:36:03 +01:00

System Information
Operating system: Linux-5.11.0-40-generic-x86_64-with-glibc2.33 64 Bits
Graphics card: AMD Radeon(TM) Vega 8 Graphics (RAVEN, DRM 3.40.0, 5.11.0-40-generic, LLVM 12.0.0) AMD 4.6 (Core Profile) Mesa 21.0.3

Blender Version
Broken: version: 3.0.0 Beta, branch: master, commit date: 2021-11-11 18:49, hash: bd734cc441

Short description of error
I tried to import a USD file with texture coordinates. Vertices, normals, faces and USDPreviewSurface are imported correctly, but there is no UV Map. The USD file works without errors in usdview.

Exact steps for others to reproduce the error

Sample USDA file:


#usda 1.0
(
    defaultPrim = "test_export3"
    metersPerUnit = 1
    upAxis = "Y"
)

def Xform "test_export3"
{
    def Mesh "mesh_test_export3_000"
    {
        float3[] extent = [(-0.5, 0, 0.5), (0.5, 1, -0.5)]
        int[] faceVertexCounts = [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3]
        int[] faceVertexIndices = [0, 1, 2, 2, 3, 0, 4, 5, 6, 6, 7, 4, 8, 9, 10, 10, 11, 8, 12, 13, 14, 14, 15, 12, 16, 17, 18, 18, 19, 16, 20, 21, 22, 22, 23, 20]
        rel material:binding = </test_export3/mesh_test_export3_000/material>
        normal3f[] normals = [(0, -1, -0), (0, -1, -0), (0, -1, -0), (0, -1, -0), (0, -1, -0), (0, -1, -0), (0, 0, 1), (0, 0, 1), (0, 0, 1), (0, 0, 1), (0, 0, 1), (0, 0, 1), (1, 0, -0), (1, 0, -0), (1, 0, -0), (1, 0, -0), (1, 0, -0), (1, 0, -0), (0, 0, -1), (0, 0, -1), (0, 0, -1), (0, 0, -1), (0, 0, -1), (0, 0, -1), (-1, 0, -0), (-1, 0, -0), (-1, 0, -0), (-1, 0, -0), (-1, 0, -0), (-1, 0, -0), (0, 1, -0), (0, 1, -0), (0, 1, -0), (0, 1, -0), (0, 1, -0), (0, 1, -0)] (
            interpolation = "faceVarying"
        )
        point3f[] points = [(0.5, 0, 0.5), (-0.5, 0, 0.5), (-0.5, 0, -0.5), (0.5, 0, -0.5), (-0.5, 0, 0.5), (0.5, 0, 0.5), (0.5, 1, 0.5), (-0.5, 1, 0.5), (0.5, 0, 0.5), (0.5, 0, -0.5), (0.5, 1, -0.5), (0.5, 1, 0.5), (0.5, 0, -0.5), (-0.5, 0, -0.5), (-0.5, 1, -0.5), (0.5, 1, -0.5), (-0.5, 0, -0.5), (-0.5, 0, 0.5), (-0.5, 1, 0.5), (-0.5, 1, -0.5), (-0.5, 1, 0.5), (0.5, 1, 0.5), (0.5, 1, -0.5), (-0.5, 1, -0.5)]
        texCoord2f[] primvars:st = [(0.5, 0.5), (-0.5, 0.5), (-0.5, -0.5), (0.5, -0.5), (-0.5, 0), (0.5, 0), (0.5, 1), (-0.5, 1), (-0.5, 0), (0.5, 0), (0.5, 1), (-0.5, 1), (-0.5, 0), (0.5, 0), (0.5, 1), (-0.5, 1), (-0.5, 0), (0.5, 0), (0.5, 1), (-0.5, 1), (-0.5, -0.5), (0.5, -0.5), (0.5, 0.5), (-0.5, 0.5)] (
            interpolation = "varying"
        )
        uniform token subdivisionScheme = "none"

        def Material "material"
        {
            token outputs:surface.connect = </test_export3/mesh_test_export3_000/material/shader.outputs:surface>

            def Shader "shader"
            {
                uniform token info:id = "UsdPreviewSurface"
                color3f inputs:diffuseColor.connect = </test_export3/mesh_test_export3_000/material/albedoTexture.outputs:rgb>
                color3f inputs:emissiveColor = (0, 0, 0)
                float inputs:metallic.connect = </test_export3/mesh_test_export3_000/material/metallicRoughnessTexture.outputs:b>
                color3f inputs:normal.connect = </test_export3/mesh_test_export3_000/material/normalTexture.outputs:rgb>
                float inputs:opacity.connect = </test_export3/mesh_test_export3_000/material/albedoTexture.outputs:a>
                float inputs:roughness.connect = </test_export3/mesh_test_export3_000/material/metallicRoughnessTexture.outputs:g>
                token outputs:surface
            }

            def Shader "textureCoordinates"
            {
                uniform token info:id = "UsdPrimvarReader_float2"
                token inputs:varname = "st"
                float2 outputs:result
            }

            def Shader "albedoTexture"
            {
                uniform token info:id = "UsdUVTexture"
                asset inputs:file = @textures/test_export3_AlbedoAlpha_0000.png@
                token inputs:sourceColorSpace = "sRGB"
                float2 inputs:st.connect = </test_export3/mesh_test_export3_000/material/textureCoordinates.outputs:result>
                token inputs:wrapS = "repeat"
                token inputs:wrapT = "repeat"
                float outputs:a
                color3f outputs:rgb
            }

            def Shader "metallicRoughnessTexture"
            {
                uniform token info:id = "UsdUVTexture"
                asset inputs:file = @textures/test_export3_MetalnessRoughness_0000.png@
                token inputs:sourceColorSpace = "raw"
                float2 inputs:st.connect = </test_export3/mesh_test_export3_000/material/textureCoordinates.outputs:result>
                token inputs:wrapS = "repeat"
                token inputs:wrapT = "repeat"
                float outputs:b
                float outputs:g
            }

            def Shader "normalTexture"
            {
                uniform token info:id = "UsdUVTexture"
                float4 inputs:bias = (-1, -1, -1, -1)
                asset inputs:file = @textures/test_export3_Normal_0000.png@
                float4 inputs:scale = (2, 2, 2, 2)
                token inputs:sourceColorSpace = "raw"
                float2 inputs:st.connect = </test_export3/mesh_test_export3_000/material/textureCoordinates.outputs:result>
                token inputs:wrapS = "repeat"
                token inputs:wrapT = "repeat"
                color3f outputs:rgb
            }
        }
    }
}

**System Information** Operating system: Linux-5.11.0-40-generic-x86_64-with-glibc2.33 64 Bits Graphics card: AMD Radeon(TM) Vega 8 Graphics (RAVEN, DRM 3.40.0, 5.11.0-40-generic, LLVM 12.0.0) AMD 4.6 (Core Profile) Mesa 21.0.3 **Blender Version** Broken: version: 3.0.0 Beta, branch: master, commit date: 2021-11-11 18:49, hash: `bd734cc441` **Short description of error** I tried to import a USD file with texture coordinates. Vertices, normals, faces and USDPreviewSurface are imported correctly, but there is no UV Map. The USD file works without errors in usdview. **Exact steps for others to reproduce the error** Sample USDA file: ``` #usda 1.0 ( defaultPrim = "test_export3" metersPerUnit = 1 upAxis = "Y" ) def Xform "test_export3" { def Mesh "mesh_test_export3_000" { float3[] extent = [(-0.5, 0, 0.5), (0.5, 1, -0.5)] int[] faceVertexCounts = [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3] int[] faceVertexIndices = [0, 1, 2, 2, 3, 0, 4, 5, 6, 6, 7, 4, 8, 9, 10, 10, 11, 8, 12, 13, 14, 14, 15, 12, 16, 17, 18, 18, 19, 16, 20, 21, 22, 22, 23, 20] rel material:binding = </test_export3/mesh_test_export3_000/material> normal3f[] normals = [(0, -1, -0), (0, -1, -0), (0, -1, -0), (0, -1, -0), (0, -1, -0), (0, -1, -0), (0, 0, 1), (0, 0, 1), (0, 0, 1), (0, 0, 1), (0, 0, 1), (0, 0, 1), (1, 0, -0), (1, 0, -0), (1, 0, -0), (1, 0, -0), (1, 0, -0), (1, 0, -0), (0, 0, -1), (0, 0, -1), (0, 0, -1), (0, 0, -1), (0, 0, -1), (0, 0, -1), (-1, 0, -0), (-1, 0, -0), (-1, 0, -0), (-1, 0, -0), (-1, 0, -0), (-1, 0, -0), (0, 1, -0), (0, 1, -0), (0, 1, -0), (0, 1, -0), (0, 1, -0), (0, 1, -0)] ( interpolation = "faceVarying" ) point3f[] points = [(0.5, 0, 0.5), (-0.5, 0, 0.5), (-0.5, 0, -0.5), (0.5, 0, -0.5), (-0.5, 0, 0.5), (0.5, 0, 0.5), (0.5, 1, 0.5), (-0.5, 1, 0.5), (0.5, 0, 0.5), (0.5, 0, -0.5), (0.5, 1, -0.5), (0.5, 1, 0.5), (0.5, 0, -0.5), (-0.5, 0, -0.5), (-0.5, 1, -0.5), (0.5, 1, -0.5), (-0.5, 0, -0.5), (-0.5, 0, 0.5), (-0.5, 1, 0.5), (-0.5, 1, -0.5), (-0.5, 1, 0.5), (0.5, 1, 0.5), (0.5, 1, -0.5), (-0.5, 1, -0.5)] texCoord2f[] primvars:st = [(0.5, 0.5), (-0.5, 0.5), (-0.5, -0.5), (0.5, -0.5), (-0.5, 0), (0.5, 0), (0.5, 1), (-0.5, 1), (-0.5, 0), (0.5, 0), (0.5, 1), (-0.5, 1), (-0.5, 0), (0.5, 0), (0.5, 1), (-0.5, 1), (-0.5, 0), (0.5, 0), (0.5, 1), (-0.5, 1), (-0.5, -0.5), (0.5, -0.5), (0.5, 0.5), (-0.5, 0.5)] ( interpolation = "varying" ) uniform token subdivisionScheme = "none" def Material "material" { token outputs:surface.connect = </test_export3/mesh_test_export3_000/material/shader.outputs:surface> def Shader "shader" { uniform token info:id = "UsdPreviewSurface" color3f inputs:diffuseColor.connect = </test_export3/mesh_test_export3_000/material/albedoTexture.outputs:rgb> color3f inputs:emissiveColor = (0, 0, 0) float inputs:metallic.connect = </test_export3/mesh_test_export3_000/material/metallicRoughnessTexture.outputs:b> color3f inputs:normal.connect = </test_export3/mesh_test_export3_000/material/normalTexture.outputs:rgb> float inputs:opacity.connect = </test_export3/mesh_test_export3_000/material/albedoTexture.outputs:a> float inputs:roughness.connect = </test_export3/mesh_test_export3_000/material/metallicRoughnessTexture.outputs:g> token outputs:surface } def Shader "textureCoordinates" { uniform token info:id = "UsdPrimvarReader_float2" token inputs:varname = "st" float2 outputs:result } def Shader "albedoTexture" { uniform token info:id = "UsdUVTexture" asset inputs:file = @textures/test_export3_AlbedoAlpha_0000.png@ token inputs:sourceColorSpace = "sRGB" float2 inputs:st.connect = </test_export3/mesh_test_export3_000/material/textureCoordinates.outputs:result> token inputs:wrapS = "repeat" token inputs:wrapT = "repeat" float outputs:a color3f outputs:rgb } def Shader "metallicRoughnessTexture" { uniform token info:id = "UsdUVTexture" asset inputs:file = @textures/test_export3_MetalnessRoughness_0000.png@ token inputs:sourceColorSpace = "raw" float2 inputs:st.connect = </test_export3/mesh_test_export3_000/material/textureCoordinates.outputs:result> token inputs:wrapS = "repeat" token inputs:wrapT = "repeat" float outputs:b float outputs:g } def Shader "normalTexture" { uniform token info:id = "UsdUVTexture" float4 inputs:bias = (-1, -1, -1, -1) asset inputs:file = @textures/test_export3_Normal_0000.png@ float4 inputs:scale = (2, 2, 2, 2) token inputs:sourceColorSpace = "raw" float2 inputs:st.connect = </test_export3/mesh_test_export3_000/material/textureCoordinates.outputs:result> token inputs:wrapS = "repeat" token inputs:wrapT = "repeat" color3f outputs:rgb } } } } ```

Steffen Hauser commented

2021-11-13 11:36:03 +01:00

Added subscriber: @shauser

Philipp Oeser commented

2021-11-15 14:40:05 +01:00

Added subscriber: @lichtwerk

Philipp Oeser self-assigned this 2021-11-15 14:40:05 +01:00

Philipp Oeser commented

2021-11-15 14:40:05 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Philipp Oeser commented

2021-11-15 14:40:05 +01:00

Can confirm, will check in a bit

Philipp Oeser removed their assignment 2022-01-18 21:07:46 +01:00

Philipp Oeser commented

2022-01-18 21:07:46 +01:00

Will have to concentrate on triaging for a while (and step down).

Bastien Montagne commented

2022-04-14 10:03:42 +02:00

Added subscribers: @makowalski, @mont29

Michael Kowalski was assigned by Bastien Montagne

2022-04-14 10:03:42 +02:00

Bastien Montagne commented

2022-04-14 10:03:42 +02:00

@makowalski Can you have a look at this one? thanks.

Michael Kowalski commented

2022-04-14 16:56:31 +02:00

I was able to reproduce the issue with the test case and am investigating.

Michael Kowalski commented

2022-04-15 00:44:46 +02:00

This is due to the "varying" primvar interpolation type not being handled in the UV conversion code. I'm addressing this.

Kevin Collins commented

2022-05-16 19:12:23 +02:00

Added subscriber: @codeloadgame

Kevin Collins commented

2022-05-16 19:12:25 +02:00

Removed subscriber: @codeloadgame

Kevin Collins commented

2022-05-16 19:12:26 +02:00

Added subscriber: @codeloadgame

Rama Hoetzlein commented

2023-01-30 04:55:12 +01:00

Added subscriber: @ramakarl

Rama Hoetzlein commented

2023-01-30 04:55:12 +01:00

Changing "varying" to "faceVarying" and using "UVMap" as the texcoord token in the input USD works.
Working USDA for texture coord input:

texCoord2f- [ ] primvars:UVMap = [(0.625, 0.5), (0.875, 0.5), (0.875, 0.75), (0.625, 0.75), (0.375, 0.75), (0.625, 0.75), (0.625, 1), (0.375, 1), (0.375, 0), (0.625, 0), (0.625, 0.25), (0.375, 0.25), (0.125, 0.5), (0.375, 0.5), (0.375, 0.75), (0.125, 0.75), (0.375, 0.5), (0.625, 0.5), (0.625, 0.75), (0.375, 0.75), (0.375, 0.25), (0.625, 0.25), (0.625, 0.5), (0.375, 0.5)] (
interpolation = "faceVarying"
)

Although we're importing per-vertex UVs, it should also be noted the number of entries in the input array is the number of face indexed vertices (sum of all faceVertexCounts).
The USD Export writes the correct number of entries. The USD Import reads correctly if written in this way.

My own exporter (non-blender) scans thru the face-vertex-index list and looks up each vertex to write. Total number of UVs written is the number of faces * vertices_per_face.

VtArray uvs( faces*3 );
int v;
for (int i=0; i < faces3; i++) {
v = polyndx- [x]; <-- look up vertices of each face
Vector2DF uv = mesh->GetVertTex(v);
uvs- [x]- [x] = uv->x;
uvs- [x]- [x] = uv->y;
}
UsdGeomPrimvarsAPI schema (usd_mesh);
UsdGeomPrimvar tcs = schema.CreatePrimvar(TfToken("UVMap"), SdfValueTypeNames->TexCoord2fArray, UsdGeomTokens->faceVarying);
tcs.Set( uvs );

veg_birch_simple.usda

Attached an example usda file /w texcoords.
If the USD file is formatted as above, the USD import of texture coordinates works in Blender.
To handle the case where texture coordinates work in usdview but not in Blender the solution might be simply to interpret the token "varying" as "faceVarying" and token "st" as "UVMap". What happens when a USD Exported file from blender with texture coordinates is loaded into usdview?
Hope this helps.

Changing "varying" to "faceVarying" and using "UVMap" as the texcoord token in the input USD works. Working USDA for texture coord input: texCoord2f- [ ] primvars:**UVMap** = [(0.625, 0.5), (0.875, 0.5), (0.875, 0.75), (0.625, 0.75), (0.375, 0.75), (0.625, 0.75), (0.625, 1), (0.375, 1), (0.375, 0), (0.625, 0), (0.625, 0.25), (0.375, 0.25), (0.125, 0.5), (0.375, 0.5), (0.375, 0.75), (0.125, 0.75), (0.375, 0.5), (0.625, 0.5), (0.625, 0.75), (0.375, 0.75), (0.375, 0.25), (0.625, 0.25), (0.625, 0.5), (0.375, 0.5)] ( interpolation = "**faceVarying**" ) Although we're importing per-vertex UVs, it should also be noted the number of entries in the input array is the number of face indexed vertices (sum of all faceVertexCounts). The USD Export writes the correct number of entries. The USD Import reads correctly if written in this way. My own exporter (non-blender) scans thru the face-vertex-index list and looks up each vertex to write. Total number of UVs written is the number of faces * vertices_per_face. VtArray<GfVec2f> uvs( **faces*3** ); int v; for (int i=0; i < faces*3; i++) { v = polyndx- [x]; **<-- look up vertices of each face** Vector2DF* uv = mesh->GetVertTex(v); uvs- [x]- [x] = uv->x; uvs- [x]- [x] = uv->y; } UsdGeomPrimvarsAPI schema (usd_mesh); UsdGeomPrimvar tcs = schema.CreatePrimvar(TfToken("**UVMap**"), SdfValueTypeNames->TexCoord2fArray, UsdGeomTokens->**faceVarying**); tcs.Set( uvs ); [veg_birch_simple.usda](https://archive.blender.org/developer/F14211347/veg_birch_simple.usda) Attached an example usda file /w texcoords. If the USD file is formatted as above, the USD import of texture coordinates works in Blender. To handle the case where texture coordinates work in usdview but not in Blender the solution might be simply to interpret the token "varying" as "faceVarying" and token "st" as "UVMap". What happens when a USD Exported file from blender with texture coordinates is loaded into usdview? Hope this helps.

Bastien Montagne added this to the Pipeline, Assets & IO project 2023-02-09 15:40:39 +01:00

Philipp Oeser removed the

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USD Import: No texture coordinates imported #93052