Support exporting "empty" materials with only a technique or shader

[libs/gl.git] / blender / io_mspgl / material.py

diff --git a/blender/io_mspgl/material.py b/blender/io_mspgl/material.py
index e8a9089adb3ffed538856da4fc3772403a7b018e..3b79036181d0d45ab6af0da226ef39cecb59e2d6 100644 (file)
--- a/blender/io_mspgl/material.py
+++ b/blender/io_mspgl/material.py
@@ -48,6 +48,7 @@ class MaterialProperty:
 class Material:
        def __init__(self, material):
                self.name = material.name
+               self.type = None
                self.properties = {}
 
                self.render_mode = material.render_mode
@@ -70,10 +71,14 @@ class Material:
 
                surface_node, _ = get_linked_node_and_socket(material.node_tree, out_node.inputs["Surface"])
                if not surface_node:
-                       raise Exception("Material has no surface node")
+                       if self.render_mode=='BUILTIN':
+                               raise Exception("Empty material can't use builtin rendering mode")
+                       return
                elif surface_node.type!='BSDF_PRINCIPLED':
                        raise Exception("Unsupported surface node type "+surface_node.type)
 
+               self.type = "pbr"
+
                base_color = self.properties["base_color"] = MaterialProperty((0.8, 0.8, 0.8, 1.0))
                metalness = self.properties["metalness"] = MaterialProperty(0.0)
                roughness = self.properties["roughness"] = MaterialProperty(0.5)