Rhino 8 DisplayConduit does not work properly for Meshes and Breps

Rhino Developer
1

Hi,

I have used a looooot of DisplayConduit in the past, but I just realized that with Rhino 8, if i try to display Breps and Meshes I am getting completely weird results, so I wonder if I am missing some additional settings needed in Rhino 8?

I created the simplest example:
TestConduit.zip (180.8 KB)

(in the example Rhinocommon is not updated…later I updated it to 8.17 - same result)

The user can select a brep and then the Conduit will try to call e.Display.DrawBrepShaded.
I expanded the example by meshing the brep as you can see, but I get the exact same result..something that looks like this:

image
image873×692 44.7 KB

image
image902×514 48 KB

With faces somehow inverted and transparent. These are the simples objects so it should work “out of the box”, but I tried to tidy up the meshes, Compute normals, etc…still the same result.

I also tried setting up a proper Display Material, like

new DisplayMaterial
            {
                Diffuse = System.Drawing.Color.Blue,     // Base color
                Specular = System.Drawing.Color.Red,  // Highlights
                Shine = 100,                            // Shininess (0-255)
                Transparency = 0.0,                     // Fully opaque
                IsTwoSided = true                       // Render both sides (optional)
            };

I still got the same result…I tried tweeking the material but the display remained the same.
What am I missing?

Thanks
Milos