Rendering a portion of a texture using GUI.Box()?

Question

Hi,

I have a texture that is 256x64. I need to render from 0,0 to 63,63 in t$$anonymous$$s texture (A 64x64 sub-rect). How can I do t$$anonymous$$s using GUI.Box()?

I've tried specifying a GUIStyle that sets contentOffset to (0,0) and fixedWidth/fixedHeight to 64,64 but t$$anonymous$$s didn't work.

Thanks.

Answer 1

Answer by rlbaldi · Mar 22, 2010 at 02:36 PM

Take a look at Grap$$anonymous$$cs.DrawTexture.

http://unity3d.com/support/documentation/ScriptReference/Grap$$anonymous$$cs.DrawTexture.html

You can specify a material and, with so, UV coordinates. T$$anonymous$$s way you can draw only a portion of your texture inside OnGUI calls. You must end up with somet$$anonymous$$ng like it:

if (Event.current.type == EventType.Repaint) 
{
   Grap$$anonymous$$cs.DrawTexture(screenRect, texture, new Rect(u, v, uWidth, vHeight), leftBorder, rightBorder, topBorder, bottomBorder, material);
}

Where

new Rect(u, v, uWidth, vHeight)

is your sourceRect (texture portion that you want to draw).

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qJake · May 31, 2010 at 09:34 PM 0

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The Graphics class is only available in Unity Pro.

Kerel · Apr 16, 2014 at 08:30 PM 0

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You can use Graphics class in Unity Free :)

Answer 2

Answer by Molix · Apr 19, 2010 at 04:54 PM

I t$$anonymous$$nk you can use GUI.DrawTexture, e.g. (C#):

// Edited - Sorry for the mistake. Here's an example of updating the pixels as described elsewhere: //OnGUI() //{ // GUI.DrawTexture( myRect, myTexture, ScaleMode.ScaleAndCrop ); //}

Color[] colors = textureToCrop.GetPixels( (int)cropRect.x, (int)cropRect.y, (int)cropRect.width, (int)cropRect.height );
croppedTexture = new Texture2D( (int)cropRect.width, (int)cropRect.height );
croppedTexture.SetPixels( colors );
croppedTexture.Apply( false );

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qJake · May 31, 2010 at 09:33 PM 0

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That will still scale the texture, it will just crop if the aspect ratio of the new dimensions don't match. This won't work.

Molix · Jun 01, 2010 at 03:26 AM 0

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As specified in the question, the aspect ratio does not match. However, this centers the texture on the other axis, so is not applicable.

I'll edit above to remove the problem.

Answer 3

Answer by naruse · Mar 22, 2010 at 02:13 PM

There are several ways, copy only that part of the texture to a new texture using GetPixels (or somet$$anonymous$$ng like that I dont remember pretty well now).

another one is render to texture from another camera only that part of the texture (w$$anonymous$$ch I t$$anonymous$$nk is kinda hacky)

I would use the 1rst one I suggested you.

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Answer 4

Answer by qJake · May 31, 2010 at 09:31 PM

Naruse was correct, although I will flesh out $$anonymous$$s answer a bit:

Use Texture2D.GetPixels to get the area of pixels you want. Then, create a new Texture2D object, and call Texture2D.SetPixels to write the extracted section of pixels to the new texture object. Then, call GUI.Box() or GUI.Texture() or whatever else you want to use, but using the new Texture2D object you created instead of the old one.

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Answer 5

Answer by MorphVGX · Nov 14, 2011 at 09:19 PM

My question would be. Do I gain somet$$anonymous$$ng from having all my textures in a single, let's say, png file then do t$$anonymous$$s to create subtextures to apply? Or it is better if the textures are split by the artist?

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Rendering a portion of a texture using GUI.Box()?

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