Moon image: alpha channel

Ezequel · 07-29-2012 10:50 PM

Hi,

I want to put a custom moon image in my project, but when I convert it from .psd or .png into .gfx file using converter from the SDK, the alpha channel is not working. When I open the PNG image, the alpha is fine there. Also in the SDK data browser my image looks good with the alpha channel working.

I tried several settings in converter, like DXT3, 2D texture, mip maps enabled. This results in an image which is visible in game, but the alpha channel is not working in game: there is whitespace over it.

When I use the standard moon.gfx file provided with the engine SDK/tutorials, the alpha from that image works fine...

Any ideas on how to make this work? Thanks in advance.

**Esenthel** · 08-02-2012 02:11 PM

can you attach the source image and GFX file, and code that you're using
also check for astronomical properties in c++ (like 'blend' param)

Ezequel · 08-02-2012 03:14 PM

Here is the code:

Code:

{

      Astro &moon=Astros.New();  

      moon.image=Images("gfx/sky/moon.gfx");

      moon.pos =!Vec(-1.8,1,1.5); 

      moon.size*=1.0f; 

      moon.blend=false;

      moon.image_color.set(50,50,50,0);

      moon.light_color.zero();

   }

If I enable moon.blend the moon will not show.
The image and GFX file are in the attachment:

.rar

moon.rar (Size: 364.57 KB / Downloads: 5)

**Esenthel** · 08-11-2012 12:54 PM

did you try setting alpha
moon.image_color.set(50,50,50,0);
to
moon.image_color.set(50,50,50,255);

Ezequel · 08-12-2012 08:12 PM

Yes, I tried 255 as value for the alpha. However, it doesn't solve the problem.

I guess the problem lies by the conversion settings in converter of the .png image to .gfx, because the alpha works fine on the .png image itself. I will create another moon image, test it and post an update here.

Thanks you for the reply.

Ezequel · 08-13-2012 06:01 PM

Update:
I made a new image and firstly got the same result.
But because the standard moon from the SDK worked fine, I tried working with alternative presets in photoshop. So instead of a transparent background, I made the background layer black, and converted the .psd file to .gfx (instead of exporting as .png first). The problem is solved now smile

Moon image: alpha channel
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