CODEWITHSUNDEEP
c#unity-game-engine
sigmaxf
sigmaxf

Reputation: 8492

Get a pixel from a relative x,y position on a scaled down UI Image in Unity 3D

I'm trying to find a pixel on an image object at the relative position Vector2(50,60). But, although the object is only 100x100, my image is 1200x1200 (for resolution scaling purposes). When I try to do:

Color color = mask.sprite.texture.GetPixel(x, y);

It returns the pixel from (50,60) on the image, and not on the gameobject (50,60 on the image is always a blank pixel)

My question: how to find out the pixel color on a downscaled gameobject UI image at the desired gameobject position.

Upvotes: 1

Views: 1894

Answers (1)

Dávid Florek
Dávid Florek

Reputation: 571

You need to calculate the position with respect to the scaling.

Vector2 originalResolution = new Vector2(1200, 1200);
Vector2 scaledResolution = new Vector2(100, 100);
Vector2 colorPixelPos = new Vector2(50, 60);
Vector2 actualPixelPos = new Vector2(colorPixelPos.x * scaledResolution.x / originalResolution.x, colorPixelPos.y * scaledResolution.y / originalResolution.y);
Color color = mask.sprite.texture.GetPixel((int)actualPixelPos.x, (int)actualPixelPos.y);

Upvotes: 3

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