From 9fceec35cce09d5e657bb3a404dc25cabc4c2e04 Mon Sep 17 00:00:00 2001
From: Cristian Ritter <cristian_ritter@hotmail.com>
Date: Mon, 26 Aug 2024 10:17:50 -0300
Subject: [PATCH] add diffuse on surface, if has no surface color

Signed-off-by: Cristian Ritter <cristian_ritter@hotmail.com>
---
 src/ifcgeom/mapping/mapping.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/ifcgeom/mapping/mapping.cpp b/src/ifcgeom/mapping/mapping.cpp
index 50d7fad3f6..c69db2dbad 100644
--- a/src/ifcgeom/mapping/mapping.cpp
+++ b/src/ifcgeom/mapping/mapping.cpp
@@ -577,6 +577,9 @@ taxonomy::ptr mapping::map_impl(const IfcSchema::IfcStyledItem* inst) {
         if (rendering_style->DiffuseColour() && process_colour(rendering_style->DiffuseColour(), rgb)) {
             const taxonomy::colour& old_diffuse = surface_style->diffuse ? surface_style->diffuse : white;
             surface_style->diffuse = taxonomy::colour(old_diffuse.r() * rgb[0], old_diffuse.g() * rgb[1], old_diffuse.b() * rgb[2]);
+            if (!surface_style->surface) {
+                surface_style->surface = surface_style->diffuse;
+            }
         }
         if (rendering_style->DiffuseTransmissionColour()) {
             // Not supported