New OBJ importer: default value for missing "vt" values is incorrect (see T68249) #97793

New Issue

Jesse Yurkovich · 2022-05-03T07:40:53+02:00

Jesse Yurkovich commented

2022-05-03 07:40:53 +02:00

System Information
Operating system: Windows-10-10.0.19044-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1070 with Max-Q Design/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 511.09

Blender Version
Broken: version: 3.2.0 Alpha, branch: master, commit date: 2022-05-02 09:18, hash: f0f44fd92f

Short description of error
Going through old reports. The optional "v" value should be defaulted to 0 but is instead FLT_MAX.

vt u v w

    Vertex statement for both polygonal and free-form geometry.

    Specifies a texture vertex and its coordinates. A 1D texture
    requires only u texture coordinates, a 2D texture requires both u
    and v texture coordinates, and a 3D texture requires all three
    coordinates.

    u is the value for the horizontal direction of the texture.

    v is an optional argument.

    v is the value for the vertical direction of the texture. The
    default is 0.

    w is an optional argument.

    w is a value for the depth of the texture. The default is 0.

Exact steps for others to reproduce the error

Import the cube.obj file from blender/blender-addons#68249
Open the UV editor and compare to what the python OBJ importer will show

Caused by the following function which defaults to FLT_MAX instead of 0.0f:

static void geom_add_uv_vertex(const StringRef line, GlobalVertices &r_global_vertices)
{
  float2 uv;
  parse_floats(line, FLT_MAX, uv, 2);
  r_global_vertices.uv_vertices.append(uv);
}

**System Information** Operating system: Windows-10-10.0.19044-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1070 with Max-Q Design/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 511.09 **Blender Version** Broken: version: 3.2.0 Alpha, branch: master, commit date: 2022-05-02 09:18, hash: `f0f44fd92f` **Short description of error** Going through old reports. The optional "v" value should be defaulted to 0 but is instead FLT_MAX. ``` vt u v w Vertex statement for both polygonal and free-form geometry. Specifies a texture vertex and its coordinates. A 1D texture requires only u texture coordinates, a 2D texture requires both u and v texture coordinates, and a 3D texture requires all three coordinates. u is the value for the horizontal direction of the texture. v is an optional argument. v is the value for the vertical direction of the texture. The default is 0. w is an optional argument. w is a value for the depth of the texture. The default is 0. ``` **Exact steps for others to reproduce the error** - Import the `cube.obj` file from blender/blender-addons#68249 - Open the UV editor and compare to what the python OBJ importer will show Caused by the following function which defaults to FLT_MAX instead of 0.0f: ``` static void geom_add_uv_vertex(const StringRef line, GlobalVertices &r_global_vertices) { float2 uv; parse_floats(line, FLT_MAX, uv, 2); r_global_vertices.uv_vertices.append(uv); } ```

Jesse Yurkovich commented

2022-05-03 07:40:53 +02:00

Added subscriber: @deadpin