Unity: Create a texture from Terrain

Question

I have a procedural generated Terrain, based on Unity's Terrain System.

Now i want a Map from the Terrain, not a minimap but a full map, that is saved as a 2D Texture.

First i thought of a RenderTexture, but if i take a Camera to catch the whole Terrain, the result depends on the resolution aspect, and i also have problems cause the width of the Terrain is 3.2x the length.

Is there a better way to solve this problem?

Answer 1

1. Make a new camera and place it over the terrain.

2. Make sure it is in orthographic mode

3. Set the camera.aspect field to terrainData.size.x / terrainData.size.z

4. Set the camera.orthographicSize field to terrainData.size.z/2f

5. Make sure the camera frame is oriented with the terrain's axes. Something along the lines of cam.transform.LookAt(terrain.GetPosition(), terrain.transform.forward); will do the trick.

Then, you should be able to create a RenderTexture with the pixel resolution you'd like (based on this answer by Rafal Wiliński):

int resHeight = 1000;
int resWidth = Mathf.RoundToInt(resHeight * camera.aspect);

RenderTexture rt = new RenderTexture(resWidth, resHeight, 24);
camera.targetTexture = rt; //Create new renderTexture and assign to camera
Texture2D screenShot = new Texture2D(resWidth, resHeight, TextureFormat.RGB24, false); //Create new texture

camera.Render();

RenderTexture.active = rt;
screenShot.ReadPixels(new Rect(0, 0, resWidth, resHeight), 0, 0); //Apply pixels from camera onto Texture2D

camera.targetTexture = null;
RenderTexture.active = null; //Clean
Destroy(rt); //Free memory

then, your terrain would be captured in screenshot