Retrieve pixel coordinates

Unity Engine
1

Hello,

I want to “analyse” an image with black points, and retrieve the coordinate of black points in a table, for use later.

It’s possible ?

An image like this :

Finally i want to increment an object on all points.

Thanks in advance :wink:

2

have a look at:

huh?

3

Thanks i’ll try to understand now :slight_smile:

I misspoke : I want to duplicate an object on all of this points.

4

You can use what LeftyRighty recommended to identify all the spots. Iterate over the whole image, for example using nested for-loops (over width and over height), and create a list of the dots you found.

Then it’s a matter for translating those pixel coordinates from your bitmap to your specific world-coordinates.

5

Thanks, i’ll try this :wink:

6

Ok… I’m a noob in scripting ^^

I don’t understand how to use all of this…

#pragma strict

function Start () {
    var texture = Resources.Load("Materials/pixelsNoirs", Texture2D);
    var color = texture.GetPixel(3,5);
   
    Debug.Log(color);
}

I juste try to display the color of a pixel, but I have an error :

7

Try adding Debug.Log(texture) directly after the Load command. I bet it didn’t load properly.

Is “pixelsNoirs” in your Ressources folder? It’s actually easier to define a public variable of type Texture2D and then drag’n’drop the relevant texture into the field via the Inspector.

8

Color ColorImLookingFor = new Color(0.3f,0.2555f,0.045f,1.0f);
for(int i =0; i< myTexture.width; i++)
{
for(int j =0; j < myTexture.height; j++)
{
Color thisColor = myTexture.GetPixel(i,j);
if(thisColor == Color.black)
{
//create instance here
}

//or

if(thisColor.r == ColorImLookingFor)
{
//create instance here
}

//or

if(thisColor.r == 0.0f && thisColor.g == 0.0f && thisColor.b == 0.0f && this.Color.a == 1.0f)
{
//create instance here
}
}
}

9

Thank you, it’s very cool :wink:

10

Amazingly I typed that on my phone :slight_smile:

1 Like