material refresh feature

tools/blender/mitsuba/ui/materials/__init__.py

@@ -20,21 +20,75 @@ import bpy
 from properties_material import MaterialButtonsPanel
 
 from extensions_framework.ui import property_group_renderer
+from mitsuba.outputs import MtsLog
+
+material_cache = {}
 
 class mitsuba_material_base(MaterialButtonsPanel, property_group_renderer):
 	COMPAT_ENGINES	= {'mitsuba'}
+	MTS_PROPS       = ['type']
+
+	def draw(self, context):
+		mat = context.material.mitsuba_material
+		if mat.name in material_cache:
+			mat_cached = material_cache[mat.name]
+		else:
+			mat_cached = {}
+			material_cache[mat.name] = mat_cached
+
+		repaint = False
+		for prop in self.MTS_PROPS:
+			prop_value = getattr(mat, prop)
+			prop_cache_value = mat_cached[prop] if prop in mat_cached else None
+			if prop_cache_value != prop_value:
+				mat_cached[prop] = prop_value
+				repaint = True
+		if repaint:
+			# Cause a repaint
+			MtsLog("Forcing a repaint")
+			context.material.preview_render_type = context.material.preview_render_type 
+		return super().draw(context)
 
 class mitsuba_material_sub(MaterialButtonsPanel, property_group_renderer):
 	COMPAT_ENGINES	= {'mitsuba'}
 	MTS_COMPAT		= set()
+	MTS_PROPS       = []
 
 	@classmethod
 	def poll(cls, context):
 		'''
 		Only show Mitsuba panel if mitsuba_material.material in MTS_COMPAT
 		'''
-		
-		return super().poll(context) and context.material.mitsuba_material.type in cls.MTS_COMPAT
+
+		return super().poll(context) and context and context.material \
+			and context.material.mitsuba_material \
+			and context.material.mitsuba_material.type in cls.MTS_COMPAT
+
+	def draw(self, context):
+		mat = context.material.mitsuba_material
+		sub_type = getattr(bpy.types, 'mitsuba_mat_%s' % mat.type)
+		mat = getattr(mat, 'mitsuba_mat_%s' % mat.type)
+		if mat.name in material_cache:
+			mat_cached = material_cache[mat.name]
+		else:
+			mat_cached = {}
+			material_cache[mat.name] = mat_cached
+			
+		props = sub_type.get_exportable_properties()
+
+		repaint = False
+		for prop_entry in props:
+			prop = prop_entry['attr']
+			prop_value = getattr(mat, prop) if hasattr(mat, prop) else None
+			prop_cache_value = mat_cached[prop] if prop in mat_cached else None
+			if prop_cache_value != prop_value:
+				mat_cached[prop] = prop_value
+				repaint = True
+		if repaint:
+			# Cause a repaint
+			MtsLog("Forcing a repaint")
+			context.material.preview_render_type = context.material.preview_render_type 
+		return super().draw(context)
 
 class MATERIAL_PT_context_material_mts(MaterialButtonsPanel, bpy.types.Panel):
 	bl_label = ""

tools/blender/mitsuba/ui/materials/composite.py

@@ -25,7 +25,7 @@ class ui_material_composite(mitsuba_material_sub, bpy.types.Panel):
 	bl_label = 'Mitsuba Composite Material'
 
 	MTS_COMPAT = {'composite'}
-	
+
 	display_property_groups = [
 		( ('material', 'mitsuba_material'), 'mitsuba_mat_composite' )
 	]

tools/blender/mitsuba/ui/materials/emission.py

@@ -35,6 +35,6 @@ class emission(mitsuba_material_base, bpy.types.Panel):
 
 	
 	def draw_header(self, context):
-		mat = active_node_mat(context.material)
-
-		self.layout.prop(mat.mitsuba_emission, "use_emission", text="")
+		if context.material:
+			mat = active_node_mat(context.material)
+			self.layout.prop(mat.mitsuba_emission, "use_emission", text="")

tools/blender/mitsuba/ui/materials/phong.py

@@ -24,7 +24,7 @@ class ui_material_phong(mitsuba_material_sub, bpy.types.Panel):
 	bl_label = 'Mitsuba Phong Material'
 
 	MTS_COMPAT = {'phong'}
-	
+
 	display_property_groups = [
 		( ('material', 'mitsuba_material'), 'mitsuba_mat_phong' )
 	]