Transparency in C#

I am trying to do transparency in DirectX with C# in MS VS.

How do you set up RenderState and Alpha values for Mesh textures

to achieve this? :-\

I am trying to do transparency in DirectX with C# in MS VS.

How do you set up RenderState and Alpha values for Mesh textures

to achieve this? :-\

I don't know about meshes ... but i use Sprite class for viewing textures.

I initiate the sprite.begin function with SpriteFlags.AlphaBlend

LDV

Hm Im not sure of an easy way to do it

But you could use a pixel shader and a mapping texture (use the texture to store the alpha values using a grayscale) then add the transparancy in the pixel shader but this is probably a much more complicated method than your looking for.

        With device.TextureState(0)
           .ColorOperation = TextureOperation.Modulate
           .ColorArgument1 = TextureArgument.TextureColor
           .ColorArgument2 = TextureArgument.Diffuse
           .AlphaOperation = TextureOperation.Modulate
           .AlphaArgument1 = TextureArgument.TextureColor
           .AlphaArgument2 = TextureArgument.Diffuse
       End With

       With device.RenderState
           .AlphaBlendEnable = True
           .SourceBlend = Blend.SourceAlpha
           .DestinationBlend = Blend.InvSourceAlpha
           .AlphaTestEnable = True
           .ReferenceAlpha = &H8
           .AlphaFunction = Compare.GreaterEqual
       End With

If you set the states like this then if the texture has an alpha value stored in it, you'll get transparency.

Sorry it's in VB.NET, but I guess you can manage.

....[/Quote]

 

Thanks for the information. I will see if I can use it. Another question I

like to ask is that what do I do to divide a large texture image (BMP)

into small textures so I can map to different rectangular objects?

Which functions I should use to divide the bitmap?

 

- Thanks. :rolleyes:

Thanks for the information. I will see if I can use it. Another question I

like to ask is that what do I do to divide a large texture image (BMP)

into small textures so I can map to different rectangular objects?

Which functions I should use to divide the bitmap?

Device.StretchRectangle should do what you want. Load the main image into a surface. Create your smaller textures and then get their surfaces by calling GetSurfaceLevel.