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Question by OperationDogBird · Sep 23, 2013 at 04:35 AM · editorraycastonscenegui

Triangles Index always zero - Custom Editor

In short, i have a custom editor script. I am trying to get the triangle index by clicking on a triangle. However, no matter what triangle on click on, the triangle index is always zero. The hit point does change as expected. Here is the portion of code i am using for the raycast which is contained within OnSceneGUI().

 var ray = HandleUtility.GUIPointToWorldRay(e.mousePosition);
 var hit = new RaycastHit();

 if (Physics.Raycast(ray, out hit))
 {
     Debug.Log("Triange Index: " + (hit.triangleIndex * 3) + " Hit Point: " + hit.point);
 }
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avatar image syclamoth · Sep 23, 2013 at 04:38 AM 0
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Are you using a meshcollider? Sorry if this sounds obvious, but I want to at least get the easy ones out of the way.

avatar image OperationDogBird · Sep 23, 2013 at 04:45 AM 0
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I sorta feel dumb now.. I didnt even think about the actual collider. Thanks. Post as answer and ill accept

avatar image syclamoth · Sep 23, 2013 at 04:45 AM 0
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Ah! that's the problem then.

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Answer by syclamoth · Sep 23, 2013 at 04:46 AM

From the Unity Scripting Reference:

Triangle index is only valid if the collider that was hit is a MeshCollider.

Just use a mesh collider instead.

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avatar image OperationDogBird · Sep 23, 2013 at 04:48 AM 0
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$$anonymous$$akes perfect sense, thanks! Coded w.o looking at the reference (tisk tisk)

avatar image syclamoth · Sep 23, 2013 at 04:48 AM 0
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No worries! It's what we're here for.

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