Question Texture Access API jobyfied approach

Hello all,

I am trying to re-use this rad jobyfied Set_Pixel_Data_Burst_Parallel example, but I can't get it to work. Can you please give me some guidance what I may be doing wrong?

I am trying to change the alpha for the pixels of a texture that are black. This is the original image RGBA32 image: https://drive.google.com/file/d/1mpJOnI804121PFuxlhtZ4VFJBAhzJp-v/view?usp=sharing

And this is the output image: all grays were changed to white and some yellow was added. Black was untouched. https://drive.google.com/file/d/1K48VjWJLNdj_nNrXmdupB0XfEZdG1wXO/view?usp=sharing

This is what I did:

- I solve for those pixels with R=0 in RGB to set its alpha=0, but debug tells me the R in RGB for black pixels is RGBA(255, 0, 0, 0) (which photoshop tells me this RGB is red?!). So I solved to change the alpha for those pixels with G=0 in RGB.

- According to the debug, all other pixels that are not G=0 in RGB are RGBA(255, 255, 255, 255), and in theory those should not have changed. However as you can see the grays also changed to white.

- Not sure if the debug is right - log says Unsupported string.Format for Burst for debug.log

This is the code I used trying to keep it as close as I can to the one you posted. I call UpdateColorRangeTransparency():

Code (CSharp):

1. UpdateColorRangeTransparency(int TexWidth, ColorRange.x, ColorRange.y);
2. void UpdateColorRangeTransparency(int TexWidth, float bottomColorRange, float topColorRange)
3.         {
4.             Unity.Collections.NativeArray<UnityEngine.Color32> data = m_Texture.GetRawTextureData<UnityEngine.Color32>();
5.             var job = new UpdateTextureColorsIntoNativeArrayBurstParallel()
6.             {
7.                 data = data,
8.                 _TexWidth = TexWidth,
9.                 bottomColorRange = bottomColorRange,
10.                 topColorRange = topColorRange
11.             };
12.             job.Schedule(TexWidth, 1).Complete();
13.         }
14.         [BurstCompile]
15.         struct UpdateTextureColorsIntoNativeArrayBurstParallel : IJobParallelFor
16.         {
17.             [NativeDisableParallelForRestriction] public NativeArray<UnityEngine.Color32> data;
18.             public int _TexWidth;
19.             public float bottomColorRange;
20.             public float topColorRange;
21.             public void Execute(int y)
22.             {
23.                 int _pixelPos = 0;
24.                 var idx = y * _TexWidth;
25.                 for (var x = 0; x < _TexWidth; ++x)
26.                 {
27.                     _pixelPos = idx++;
28.                
29.                     if (data[_pixelPos].g >= bottomColorRange && data[_pixelPos].g < topColorRange)//bottomColorRange is 0; topColorRange is 25
30.                     {
31.                         data[_pixelPos] = new UnityEngine.Color(data[_pixelPos].r, data[_pixelPos].g, data[_pixelPos].b, 0);
32.                         Debug.Log("INRANGE - Data is "+ data[_pixelPos] + " vs range bottom " + bottomColorRange + " top range "+ topColorRange);
33.                     }
34.                     else
35.                     {
36.                         data[_pixelPos] = new UnityEngine.Color(data[_pixelPos].r, data[_pixelPos].g, data[_pixelPos].b, 255);
37.                         Debug.Log("OUTSIDERANGE - Data is " + data[_pixelPos] + " vs range bottom " + bottomColorRange + " top range " + topColorRange);
38.                     }
39.                 }
40.             }
41.         }

 

In case someone lands in this thread, making all color32 zero worked: data[_pixelPos] = new UnityEngine.Color32(0, 0, 0, 0);