Let user control section plane colour

src/ifcblenderexport/blenderbim/bim/operator.py

@@ -1877,7 +1877,7 @@ class AddSectionPlane(bpy.types.Operator):
         backfacing = group.nodes.new(type='ShaderNodeNewGeometry')
         backfacing_mix = group.nodes.new(type='ShaderNodeMixShader')
         emission = group.nodes.new(type='ShaderNodeEmission')
-        emission.inputs['Color'].default_value = (1, 0, 0, 1)
+        emission.inputs['Color'].default_value = list(bpy.context.scene.BIMProperties.section_plane_colour) + [1]
 
         group.links.new(backfacing.outputs['Backfacing'], backfacing_mix.inputs['Fac'])
         group.links.new(group_input.outputs[''], backfacing_mix.inputs[1])

src/ifcblenderexport/blenderbim/bim/prop.py

@@ -17,6 +17,7 @@ from bpy.props import (
     BoolProperty,
     IntProperty,
     FloatProperty,
+    FloatVectorProperty,
     CollectionProperty
 )
 
@@ -851,6 +852,7 @@ class BIMProperties(PropertyGroup):
     active_property_set_template: PointerProperty(type=PropertySetTemplate)
     property_templates: CollectionProperty(name='Property Templates', type=PropertyTemplate)
     should_section_selected_objects: BoolProperty(name="Section Selected Objects", default=False)
+    section_plane_colour: FloatVectorProperty(name='Section Plane Colour', subtype='COLOR', default=(1, 0, 0), min=0.0, max=1.0)
     ifc_selector: StringProperty(default='', name='IFC Selector')
     csv_attributes: CollectionProperty(name='CSV Attributes', type=StrProperty)
 

src/ifcblenderexport/blenderbim/bim/ui.py

@@ -454,6 +454,9 @@ class BIM_PT_section_plane(Panel):
         row = layout.row()
         row.prop(props, 'should_section_selected_objects')
 
+        row = layout.row()
+        row.prop(props, 'section_plane_colour')
+
         row = layout.row(align=True)
         row.operator('bim.add_section_plane')
         row.operator('bim.remove_section_plane')