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Fix: USD: Use exr instead of hdr for world light texture

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The spec for .usdz permits only a small handful of file formats to be
contained in the archive, and HDR is not among those supported[1]. This
also causes validation errors with the `usdchecker` tool (will be
properly tested in a follow up change).

Ignoring the potential for a user to export a .usdz file with materials
referencing unsupported file formats, Blender itself should use only
the supported formats for its business.

[1] https://openusd.org/release/spec_usdz.html#usdz-specification

Pull Request: https://projects.blender.org/blender/blender/pulls/144101
This commit is contained in:
Jesse Yurkovich
2025-08-07 20:54:22 +02:00
committed by Jesse Yurkovich
parent 8bf975325b
commit 2822b3badf
2 changed files with 10 additions and 11 deletions
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15
source/blender/io/usd/intern/usd_capi_export.cc
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@@ -359,20 +359,19 @@ std::string get_image_cache_file(const std::string &file_name, bool mkdir)
std::string cache_image_color(const float color[4])
{
char name[128];
SNPRINTF(name,
"color_%02d%02d%02d.hdr",
int(color[0] * 255),
int(color[1] * 255),
int(color[2] * 255));
std::string name = fmt::format("color_{:02X}{:02X}{:02X}.exr",
int(color[0] * 255),
int(color[1] * 255),
int(color[2] * 255));
std::string file_path = get_image_cache_file(name);
if (BLI_exists(file_path.c_str())) {
return file_path;
}
ImBuf *ibuf = IMB_allocImBuf(4, 4, 32, IB_float_data);
ImBuf *ibuf = IMB_allocImBuf(1, 1, 32, IB_float_data);
IMB_rectfill(ibuf, color);
ibuf->ftype = IMB_FTYPE_RADHDR;
ibuf->ftype = IMB_FTYPE_OPENEXR;
ibuf->foptions.flag = R_IMF_EXR_CODEC_RLE;
if (IMB_save_image(ibuf, file_path.c_str(), IB_float_data)) {
CLOG_INFO(&LOG, "%s", file_path.c_str());