Fog Of War Transparency With Software

[AGP]

I''m writing a strategy game and can't seem to properly paint a transparent PNG on my fog (so that its edges are rounded). The logic for the texture placement is sound and has been tested. But all I get is solid black.

Code Select Expand


if (!TextureManager.getInstance().containsTexture("fog-top")) {
     TextureManager.getInstance().addTexture("fog-top", new Texture("Assets"+File.separator+"fog-top.png", true));
     TextureManager.getInstance().addTexture("fog-left", new Texture("Assets"+File.separator+"fog-left.png", true));
     TextureManager.getInstance().addTexture("fog-right", new Texture("Assets"+File.separator+"fog-right.png", true));
     TextureManager.getInstance().addTexture("fog-bottom", new Texture("Assets"+File.separator+"fog-bottom.png", true));
}


[EgonOlsen]

Then most likely your objects aren't rendered with transparency enabled or your textures' alpha channel is off.

[AGP]

The textures are right. I set transparency to 0.

[EgonOlsen]

Can you upload such a texture for me to see?

[AGP]

Yup.

https://www.dropbox.com/s/yzwpl76o8zuzy2e/fog-left.png?dl=0

[EgonOlsen]

That texture has an alpha channel assigned to it that makes the white part transparent. I would guess that you actually want it the other way around?

[AGP]

No, those are the edges of the fog of war. The fog is black, naturally.

[EgonOlsen]

I can't see anything wrong with it nor with the rendering itself in my simple test case. Do you have a screen shot that shows the problem? Just to be sure that we are talking about the same thing here.

[AGP]

No problem.

https://www.dropbox.com/s/l7lqhpehh19f2qe/FogProblem.png?dl=0

[EgonOlsen]

There quads don't seem to have any transparency applied to it. Alpha channel aside, they should be transparent anyway with a value of 0.

[AGP]

They are set to 0.

[EgonOlsen]

Doesn't look like it. Do you have a test case?

[AGP]

I wrote a simple test and transparency worked. So then I wrote the following method, and all I get are "End of printOddTransparencies()" prints. So now I'm stumped.

Code Select Expand


     public void printOddTransparencies(World theWorld) {
for (int y = 0; y < planes[0].length; y++)
     for (int x = 0; x < planes.length; x++)
if (theWorld.containsObject(planes[x][y]) && planes[x][y].getTransparency() != 0)
     System.out.println("Odd transparency at ("+x+", "+y+"): "+planes[x][y].getTransparency());
System.out.println("End of printOddTransparencies()");
     }


[EgonOlsen]

Maybe the texture itself hasn't been loaded properly? Albeit that doesn't explain why it's pitch black, but just to be sure...

[AGP]

I tested both the application logic (by replacing them with solid-color textures) and the same loading line (TextureManager.getInstance().addTexture("fog-left.png", new Texture("Assets"+File.separator+"fog-left.png", true))). Could it be relative to the number of polygons, or the sheer scale of the world? Maybe force-sorting the transparency list would fix it. Because number of polygons and size of the world are the only two different things between my test and the actual game.