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[NormalMap] Restore Z from X and Y


xrModder
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Plugin to restore Z from X and Y.

 

Spoiler
// Name:		xy2xyz
// Submenu:		
// Author:		iOrange & xrModder
// Title:		xy2xyz
// Version:		0.1
// Desc:		Restore Z from X and Y
// Keywords:	
// URL:			
// Help:		

float Clamp(float v, float a, float b)
{
	return Math.Min(b, Math.Max(a, v));
}

void Render(Surface dst, Surface src, Rectangle rect)
{
	ColorBgra srcPixel, dstPixel = new ColorBgra();

	// Fill alpha channel with white
	dstPixel.A = 255;

	for (int y = rect.Top; y < rect.Bottom; ++y)
	{
		if (IsCancelRequested) return;

		for (int x = rect.Left; x < rect.Right; ++x)
		{
			srcPixel = src[x, y];

			// Convert R and G channel (0...255) to X and Y (-1...+1)
			float nx = (float)srcPixel.R / 127.5f - 1.0f;
			float ny = (float)srcPixel.G / 127.5f - 1.0f;

			// Calculate Z
			float nz = (float)Math.Sqrt(Clamp(1.0f - (nx * nx + ny * ny), 0.0f, 1.0f));

			// Keep R and G channel unchanged
			dstPixel.R = srcPixel.R;
			dstPixel.G = srcPixel.G;

			// Convert Z (0...1) to B channel (0...255)
			dstPixel.B = (byte)Clamp(nz * 127.5f + 127.5f, 0.0f, 255.0f);

			dst[x, y] = dstPixel;
		}
	}
}

 

xy2xyz.jpg

 

To install, copy xy2xyz.dll to the Effects folder.

xy2xyz.dll

 

Edited by xrModder
Putting things in order
  • Like 2
  • Upvote 1
  • You're a Smart Cookie! 1
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Hello @xrModder - congratulations on this plugin!

 

Can I suggest you change the location of it to Effects > Height Map? There are several tools which use this submenu, and I think yours will be a good fit.

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[RUS] Можно восстановить любой NormalMap, если в текстуре есть X и Y. К примеру X в NormalMap игры Survarium находится в альфа канале (так как при сжатии DXT5 (BC3) в зелёном канале практический нет потерь, а альфа канал остается без изменении).

 

[ENG] You can restore any NormalMap, if the texture contains X and Y. For example, X in the NormalMap of Survarium is in the alpha channel (since with DXT5 (BC3) compression in the green channel there is practically no loss, and the alpha channel remains unchanged).

 

Пример кода / Sample code:

 

			...

			float nx = (float)srcPixel.A / 127.5f - 1.0f;
			float ny = (float)srcPixel.G / 127.5f - 1.0f;

			float nz = (float)Math.Sqrt(Clamp(1.0f - (nx * nx + ny * ny), 0.0f, 1.0f));

			dstPixel.R = srcPixel.A;
			dstPixel.G = srcPixel.G;

			dstPixel.B = (byte)Clamp(nz * 127.5f + 127.5f, 0.0f, 255.0f);

			...

 

xy2xyz.jpg

Edited by xrModder
+ English text
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In English please @xrModder. It is acceptable to post a Google Translation :)

 

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Plugin update (v0.2):

  • added help;
  • ability to invert the X and Y axes.
Spoiler
// Name:		xy2xyz
// Submenu:		Advanced
// Author:		iOrange & xrModder
// Title:		xy2xyz
// Version:		0.2
// Desc:		Restore Z from X and Y (convert XY Normal Map to XYZ Normal Map)
// Keywords:	Normal Map
// URL:			https://forums.getpaint.net/profile/161661-xrmodder/
// Help:		The plugin restores the Z axis of the Normal Map from the existing X and Y axes. By default, in the original image, the X and Y axis are respectively in the R and G channels.

#region UICode
CheckboxControl InvertXAxis = false; // Invert X axis
CheckboxControl InvertYAxis = false; // Invert Y axis
#endregion

float Clamp(float v, float a, float b)
{
	return Math.Min(b, Math.Max(a, v));
}

void Render(Surface dst, Surface src, Rectangle rect)
{
	ColorBgra srcPixel, dstPixel = new ColorBgra();

	// Fill alpha channel with white
	dstPixel.A = 255;

	for (int y = rect.Top; y < rect.Bottom; ++y)
	{
		if (IsCancelRequested) return;

		for (int x = rect.Left; x < rect.Right; ++x)
		{
			srcPixel = src[x, y];

			// Invert X axis
			if (InvertXAxis)
			{
				srcPixel.R = (byte)(255 - srcPixel.R);
			}

			// Invert Y axis
			if (InvertYAxis)
			{
				srcPixel.G = (byte)(255 - srcPixel.G);
			}

			// Convert R and G channel (0...255) to X and Y (-1...+1)
			float nx = (float)srcPixel.R / 127.5f - 1.0f;
			float ny = (float)srcPixel.G / 127.5f - 1.0f;

			// Calculate Z
			float nz = (float)Math.Sqrt(Clamp(1.0f - (nx * nx + ny * ny), 0.0f, 1.0f));

			// Keep R and G channel unchanged
			dstPixel.R = srcPixel.R;
			dstPixel.G = srcPixel.G;

			// Convert Z (0...1) to B channel (0...255)
			dstPixel.B = (byte)Clamp(nz * 127.5f + 127.5f, 0.0f, 255.0f);

			dst[x, y] = dstPixel;
		}
	}
}

 

 

To install, copy xy2xyz.dll to the Effects folder.

xy2xyz.dll

Edited by xrModder
Putting things in order
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Plugin update (v0.3):

  • choice of channel X and Y.
Spoiler
// Name:		xy2xyz
// Submenu:		Advanced
// Author:		iOrange & xrModder
// Title:		xy2xyz
// Version:		0.3
// Desc:		Restore Z from X and Y (convert XY Normal Map to XYZ Normal Map)
// Keywords:	Normal Map
// URL:			https://forums.getpaint.net/profile/161661-xrmodder/
// Help:		The plugin restores the Z axis of the Normal Map from the existing X and Y axes. By default, in the original image, the X and Y axis are respectively in the R and G channels.

#region UICode
RadioButtonControl XAxisChannel = 0; // X axis channel|Red|Green|Blue|Alpha
RadioButtonControl YAxisChannel = 1; // Y axis channel|Red|Green|Blue|Alpha
CheckboxControl InvertXAxis = false; // Invert X axis
CheckboxControl InvertYAxis = false; // Invert Y axis
#endregion

float Clamp(float v, float a, float b)
{
	return Math.Min(b, Math.Max(a, v));
}

void Render(Surface dst, Surface src, Rectangle rect)
{
	ColorBgra srcPixel, dstPixel = new ColorBgra();

	// Fill alpha channel with white
	dstPixel.A = 255;

	for (int y = rect.Top; y < rect.Bottom; ++y)
	{
		if (IsCancelRequested) return;

		for (int x = rect.Left; x < rect.Right; ++x)
		{
			srcPixel = src[x, y];

			// X axis channel switch
			switch(XAxisChannel)
			{
				case 0:
					srcPixel.R = srcPixel.R;
					break;
				case 1:
					srcPixel.R = srcPixel.G;
					break;
				case 2:
					srcPixel.R = srcPixel.B;
					break;
				case 3:
					srcPixel.R = srcPixel.A;
					break;
			}

			// Y axis channel switch
			switch(YAxisChannel)
			{
				case 0:
					srcPixel.G = srcPixel.R;
					break;
				case 1:
					srcPixel.G = srcPixel.G;
					break;
				case 2:
					srcPixel.G = srcPixel.B;
					break;
				case 3:
					srcPixel.G = srcPixel.A;
					break;
			}

			// Invert X axis
			if (InvertXAxis)
			{
				srcPixel.R = (byte)(255 - srcPixel.R);
			}

			// Invert Y axis
			if (InvertYAxis)
			{
				srcPixel.G = (byte)(255 - srcPixel.G);
			}

			// Convert R and G channel (0...255) to X and Y (-1...+1)
			float nx = (float)srcPixel.R / 127.5f - 1.0f;
			float ny = (float)srcPixel.G / 127.5f - 1.0f;

			// Calculate Z
			float nz = (float)Math.Sqrt(Clamp(1.0f - (nx * nx + ny * ny), 0.0f, 1.0f));

			// Keep R and G channel unchanged
			dstPixel.R = srcPixel.R;
			dstPixel.G = srcPixel.G;

			// Convert Z (0...1) to B channel (0...255)
			dstPixel.B = (byte)Clamp(nz * 127.5f + 127.5f, 0.0f, 255.0f);

			dst[x, y] = dstPixel;
		}
	}
}

 

To install, copy xy2xyz.dll to the Effects folder.

xy2xyz.dll

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