🐛 Check optionals before access

Author: karnkaul

lib/scene/src/gltf_loader.cpp

@@ -58,9 +58,9 @@ Material to_material(gltf::Material const& material) {
 	ret->roughness = material.pbr.roughness_factor;
 	ret->alpha_mode = material.alpha_mode;
 	ret->alpha_cutoff = material.alpha_cutoff;
-	ret->base_colour = material.pbr.base_colour_texture->texture;
-	ret->roughness_metallic = material.pbr.metallic_roughness_texture->texture;
-	ret->emissive = material.emissive_texture->texture;
+	if (material.pbr.base_colour_texture) { ret->base_colour = material.pbr.base_colour_texture->texture; }
+	if (material.pbr.metallic_roughness_texture) { ret->roughness_metallic = material.pbr.metallic_roughness_texture->texture; }
+	if (material.emissive_texture) { ret->emissive = material.emissive_texture->texture; }
 	ret->emissive_factor = material.emissive_factor;
 	return {std::move(ret)};
 }