obj: reduce vertex colors to 4 decimal places, reenable tests

OBJ vertex color related tests were not producing identical results
across various platforms, primarily due to sRGB<->Linear color space
conversions.

While D15193 has just made the color space conversion accuracy match
much closer between platforms, it's still not 100% the same.

This change reduces the amount of decimal places used for exporting
vertex colors, to 4 digits (down from 6). Vertex normals were
already always printed with 4 digits, and colors are conceptually
similar (usually 0..1 range etc.).

This makes the vertex color tests pass again, so re-enable them
after adjusting to 4 decimals expectations.

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/io/wavefront_obj/exporter/obj_export_io.hh b/source/blender/io/wavefront_obj/exporter/obj_export_io.hh
index 157d7760307..5413c9969e3 100644
--- a/source/blender/io/wavefront_obj/exporter/obj_export_io.hh
+++ b/source/blender/io/wavefront_obj/exporter/obj_export_io.hh
@@ -132,7 +132,7 @@ constexpr FormattingSyntax syntax_elem_to_formatting(const eOBJSyntaxElement key
       return {"v {:.6f} {:.6f} {:.6f}\n", 3, is_type_float<T...>};
     }
     case eOBJSyntaxElement::vertex_coords_color: {
-      return {"v {:.6f} {:.6f} {:.6f} {:.6f} {:.6f} {:.6f}\n", 6, is_type_float<T...>};
+      return {"v {:.6f} {:.6f} {:.6f} {:.4f} {:.4f} {:.4f}\n", 6, is_type_float<T...>};
     }
     case eOBJSyntaxElement::uv_vertex_coords: {
       return {"vt {:.6f} {:.6f}\n", 2, is_type_float<T...>};