Print Page - Sprite Rotation and Alphas

Title: Sprite Rotation and Alphas
Post by: Atelier on Sat 04/05/2013 20:01:23

I'm using Khris' Dynamic Sprite Rotation Module: http://www.adventuregamestudio.co.uk/forums/index.php?topic=33122.msg601519#msg601519

Is there any way to preserve the alpha channel of sprites after rotation? Antialiasing is lost as soon as I do so, and I get black edges.

Thanks
Atelier

Title: Re: Sprite Rotation and Alphas
Post by: Khris on Sun 05/05/2013 15:03:51

All the module does is store the current angle of each rotated sprite. The actual rotation is done by AGS.

Which means if you do:
DynamicSprite* sprite = DynS.CreateFromExistingSprite(slot, true); // preserve alpha channel

and the rotated version still loses the alpha channel, it's AGS's fault.

Title: Re: Sprite Rotation and Alphas
Post by: Atelier on Mon 06/05/2013 14:59:37

Hmm ok. It doesn't look pretty but it's nothing major. Cheers!

Title: Re: Sprite Rotation and Alphas
Post by: Crimson Wizard on Mon 06/05/2013 15:23:47

That's pretty strange, I made this script, and sprite's translucent areas are drawn properly:

Code (ags) Select


function room_AfterFadeIn()
{
  DynamicSprite *spr = DynamicSprite.CreateFromExistingSprite(1, true);
  spr.Rotate(45);
  Overlay *o = Overlay.CreateGraphical(10, 10, spr.Graphic, true);
  Wait(100);
}

NOTE: it's interesting, it works right even if I create non-transparent overlay (Overlay.CreateGraphical's last parameter is false)

The game is 32-bit, sprite is imported from png with alpha channel.

Maybe we could compare our actions to find out what did you do different?

Using AGS 3.2.1 btw.

Adventure Game Studio

AGS Support => Beginners' Technical Questions => Topic started by: Atelier on Sat 04/05/2013 20:01:23