OnPreviewGUI and friends

I am completely baffled by how hard it has been to get this working...

PreviewRenderUtility seems to be the right choice to draw a Mesh inside a CustomPreview but I can't for the life of me figure out how to properly use it within the OnPreviewGUI call...

Anybody have any working examples? I've already trolled the internet the best I know how.

 

That's a rather vague question... What exactly isn't working?

And if you want an already pre-made solution for displaying preview, check my signature for Advanced Inspector.

 

Man you are super useful lol (not being sarcastic at all - you know plenty about editor scripting, would love to pick your brain off-forum sometime)


To be more specific, I would like to draw an arbitrary mesh inside a ObjectPreview's OnInteractivePreviewGUI or OnPreviewGUI call and would like to know if there's a "Preferred" method for doing this rather than just GL'ing my way through it.

edit:
Would like to draw the mesh inside the Inspector's Preview window, not a SceneView.

 

Sorry... I meant that this is a very large situation. My package's file for handling previews is over 600 lines of code.

OnPreviewGUI is only a simple GUI drawing, so you need to create a camera, a copy of your mesh, lights, place everything in an empty scene, render it to a texture, and draw that texture on the GUI, most likely by using GUI.DrawTexture.

If you want some control, like dragging the mesh around, it becomes a bit more complex.

My advice would be to get a reflection application, like .NET Reflector, and to take a peak at the UnityEditor.dll.

 

Thank you That's all I needed to know heh. Didn't want to delve that deep if I didn't have to.

 

If you don't need anything fancy and just a view of your mesh "as is", the PreviewRenderUtility can do the job just fine... Just noticed there is no API documentation for this class.

It should probably look like this;

Code (csharp):

1. public override void OnPreviewGUI(Rect region, GUIStyle background)
2. {
3.     previewUtility.BeginPreview(region, background);
4.     previewUtility.DrawMesh(myMesh, Matrix4x4.identity, myMaterial, 0);
5.     Texture texture = previewUtility.EndPreview();
6.     GUI.DrawTexture(region, texture, ScaleMode.StretchToFill, false);
7. }

 

I think my hang up was that I didn't realize preview utility has its own camera of sorts built in.

I think i'm good now