Question by jesta · Sep 02, 2012 at 09:12 PM · texture material rendertexture render

Using RenderTextures in editor script

Hi,

I'm currently implementing a node-based editor to create procedural heightmaps and materials and the editor contains a "preview" window that displays the output material.

I have a function that renders a material to a full-screen quad and then saves that quad as a RenderTexture. I then use this RenderTexture as a source to other materials' properties.

Here is my function to save a material as a texture. This function is called on each MouseUp event.

 public Texture GetHeightMapRT(Material mat)
 {
     heightmapRT = new RenderTexture(rtWidth, rtHeight, 24, RenderTextureFormat.ARGB32);
 
     GameObject renderCamera = new GameObject();
     renderCamera.AddComponent<Camera>();
     renderCamera.GetComponent<Camera>().backgroundColor = Color.black;
     renderCamera.GetComponent<Camera>().orthographic = true;
     renderCamera.GetComponent<Camera>().orthographicSize = 5;
     renderCamera.GetComponent<Camera>().transform.localPosition = new Vector3(9999, 10009, 9999);
     renderCamera.GetComponent<Camera>().transform.localRotation = Quaternion.Euler(new Vector3(90.0f, 0.0f, 0.0f));
 
     GameObject renderPlane = GameObject.CreatePrimitive(PrimitiveType.Plane);
     renderPlane.transform.localPosition = new Vector3(9999, 9999, 9999);
     renderPlane.transform.localRotation = Quaternion.Euler(new Vector3(0, 0, 0));
     renderPlane.GetComponent<MeshRenderer>().material = mat;
 
     RenderTexture.active = heightmapRT;
 
     renderCamera.GetComponent<Camera>().targetTexture = heightmapRT;
     renderCamera.GetComponent<Camera>().Render();
     renderCamera.GetComponent<Camera>().targetTexture = null;
 
     RenderTexture.active = null;
     DestroyImmediate(renderPlane);
     DestroyImmediate(renderCamera);
         
     return heightmapRT;
 }

This function works, but I get the following error when it is called: