1

Hi guys, how are you? So, I need help to solution a problem in my game, how do I make to select just a part of the texture in GUI.DrawTexture and don’t to show the rest? thanks a lot!

3

Using GUI.DrawTextureWithTexCoords

Parameters

position: Represent position and “total” size of texture.
texCoords: Use percentage per unit. Relative Left-Lower corner, and relative scale.

Axes Origin

OnGUI origin is Left-Upper corner: position parameter use this origin.
But, in DrawTextureWithTexCoords the origin is Left-Lower corner: texCoords use this origin.

With texCoords parameter you can crop(percentage between 0-1) or tile image (width or height upper to 1).

To maintain aspect, also you must change “total” size of texture(position parameter).

Before this, you need save texture initial size(width,height).

using UnityEngine;
using System.Collections;


[ExecuteInEditMode]
public class NewBehaviourScript : MonoBehaviour {
	
	public Texture image;
	
	
	[Range(0f,1f)]
	public float x=0f;
	
	[Range(0f,1f)]
	public float y=0f;
	
	[Range(0f,1f)]
	public float width=1f;
	
	[Range(0f,1f)]
	public float height=1f;
	
	
	float initialWidth,initialHeight;
	bool imageEnabled=false;
	
	void Update(){
		
		if(!this.imageEnabled) if(this.image!=null){
			
			this.initialWidth = this.image.width;
			this.initialHeight = this.image.height;
			this.imageEnabled=true;
			
		}
		
	}
	
	void OnGUI(){
		
		if(imageEnabled){
			
			Rect position = new Rect(0f,0f,this.initialWidth*this.width,this.initialHeight*this.height);
			Rect coords = new Rect(this.x,this.y,this.width,this.height);
			GUI.DrawTextureWithTexCoords(position,this.image,coords);
			
		}
		
	}
	
}
2

You could use a GUI.BeginGroup to crop it, e.g.

public Texture2D texture;
public Rect textureCrop = new Rect( 0.1f, 0.1f, 0.5f, 0.25f );
public Vector2 position = new Vector2( 10, 10 );
	
void OnGUI()
{
	GUI.BeginGroup( new Rect( position.x, position.y, texture.width * textureCrop.width, texture.height * textureCrop.height ) );
	GUI.DrawTexture( new Rect( -texture.width * textureCrop.x, -texture.height * textureCrop.y, texture.width, texture.height ), texture );
	GUI.EndGroup();
}