8.20+ DisplayPipelineAttributes - Set BackFace Material/Color?

Rhino Developer
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1

Hello everyone,

I simply want to set my DisplayPipelineAttributes to render back faces in a color of my choosing with an opacity of my choosing. Lets say WhiteSmoke and 0.5 Transparency.

The idea is that the front faces will be solid/their render material and the backfaces will be slightly transparent but not hidden.

Most of the time I cull backfaces but for this application I need to show them ghosted.

I thought this would be a pretty easy attribute property but I’m confused as their are some new options now as of 8.20+

You can see here that when I modify my DisplayMode I can color the backface no problem.

But my conduit shows solid for the backfaces:

image
image1626×594 118 KB

I’m trying to set the “conduit obj” to look like the “rhino geo” and I think this should be done in the DisplayPipelineAttributes for my custom conduit but I can’t seem to get it working.

DisplayPipelineAttributes Docs

Specifically:
BackfaceDisplayStyle
BackfaceStyle

Relevant excerpt:

            # Back face settings
            attr.Material.BackDiffuse = sd.Color.WhiteSmoke
            attr.Material.BackTransparency = 0.5
            attr.Material.IsTwoSided = True
            attr.CullBackfaces = False
            # attr.UseBackfaceMaterial = True
            # attr.UseObjectBackfaceMaterial = True
            attr.BackMaterialDiffuseColor = sd.Color.WhiteSmoke
            attr.BackMaterialTransparency = 0.5
            # attr.BackfaceStyle = rd.DisplayPipelineAttributes.BackfaceStyle.CustomMaterialAllBackfaces

the full function:

        @staticmethod
        def Geometry():
            attr = Display.PreviewAttributes()
            attr.CurveColor = sd.Color.FromArgb(105, 105, 105, 255)  # Medium Grey #sd.Color.Black  #Utils.ParseHexColor(UI.drawing_colors.get("new"), 255)
            attr.CurveThickness = 1
            attr.ObjectColor = sd.Color.White  # Utils.ParseHexColor(UI.drawing_colors.get("new"), 200)
            attr.ColorSource = Rhino.DocObjects.ObjectColorSource.ColorFromObject
            attr.TextColor = Color.White
            attr.CustomGroundPlaneShadowOnly = True

            """Properties for surface edges and section cut fills/colors"""
            attr.ShowClippingFills = True
            attr.ClippingPlaneFillColorUse = rd.DisplayPipelineAttributes.ClippingPlaneFillColorUse.SolidColor
            attr.ClippingFillColor = Color.Blue
            attr.ClippingEdgeColor = Color.Magenta
            attr.ClippingEdgeThickness = 10

            attr.ClippingShadeTransparency = 0.0  # 0.0 for opaque, 1.0 for transparent
            attr.ClippingShadeSelectedPlane = True

            attr.Material.Diffuse = sd.Color.WhiteSmoke
            attr.Material.Transparency = 0.0

            # Back face settings
            attr.Material.BackDiffuse = sd.Color.WhiteSmoke
            attr.Material.BackTransparency = 0.5
            attr.Material.IsTwoSided = True
            attr.CullBackfaces = False
            # attr.UseBackfaceMaterial = True
            # attr.UseObjectBackfaceMaterial = True
            attr.BackMaterialDiffuseColor = sd.Color.WhiteSmoke
            attr.BackMaterialTransparency = 0.5
            # attr.BackfaceStyle = rd.DisplayPipelineAttributes.BackfaceStyle.CustomMaterialAllBackfaces

            attr.ShowCurves = True

            attr.ShowSurfaceEdge = True
            attr.ShowSurfaceEdges = True

            attr.SurfaceEdgeThickness = 1
            attr.SurfaceEdgeThickness = 1.0
            attr.SurfaceEdgeColor = sd.Color.FromArgb(105, 105, 105, 255)  # Medium Grey

            # attr.CastShadows = True
            # attr.AmbientLightingColor = sd.Color.Red
            # attr.IgnoreHighlights = True
            return attr

Thank you for your help!