Java-Gaming.org    
Featured games (79)
games approved by the League of Dukes
Games in Showcase (477)
Games in Android Showcase (107)
games submitted by our members
Games in WIP (535)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
 
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  2D Translucent Sprites in 3d (2.5D)  (Read 2057 times)
0 Members and 1 Guest are viewing this topic.
Online wessles

JGO Wizard


Medals: 65
Projects: 4
Exp: 3 years


Radirius Software Developer


« Posted 2013-09-04 06:14:19 »

Hello!
So, I have a whole bunch of translucent sprites next to each other. I did the whole
1  
2  
3  
glDisable(GL_DEPTH_TEST);
      glEnable(GL_BLEND);
      glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA );
But it just made it go under the floor, like this:



What do I do?

Offline HeroesGraveDev

JGO Kernel


Medals: 238
Projects: 11
Exp: 2 years


┬─┬ノ(ಠ_ಠノ)(╯°□°)╯︵ ┻━┻


« Reply #1 - Posted 2013-09-04 06:55:28 »

You disabled depth testing for some reason

Offline Orangy Tang

JGO Kernel


Medals: 56
Projects: 11


Monkey for a head


« Reply #2 - Posted 2013-09-04 11:01:57 »

If you want hard-edged sprites like those, keep depth test enabled, disable alpha blend and enable alpha test. Then they'll be sorted properly with the rest of your opaque geometry.

You may also want to set an alpha test reference value.

[ TriangularPixels.com - Play Growth Spurt, Rescue Squad and Snowman Village ] [ Rebirth - game resource library ]
Games published by our own members! Check 'em out!
Legends of Yore - The Casual Retro Roguelike
Online wessles

JGO Wizard


Medals: 65
Projects: 4
Exp: 3 years


Radirius Software Developer


« Reply #3 - Posted 2013-09-05 23:26:28 »

Now the alpha is just black.
1  
2  
3  
4  
5  
6  
7  
8  
9  
10  
11  
12  
13  
14  
15  
16  
17  
glDisable(GL_BLEND);
      glEnable(GL_ALPHA_TEST_FUNC);
     
      glPushMatrix();
      glTranslatef(x + 4.5f, y + 9, z);
      glRotatef((float)Math.toDegrees(Math.atan2(-Camera.x - 4.5f - x, -Camera.z - z)), 0, 1, 0);
      glTranslatef(-4.5f, -9, 0);

      FloatBuffer[] fba = initTVAO(4, 3, 2, new float[] { 0, 0, 0, 0, 18, 0, 9, 18, 0, 9, 0, 0 }, new float[] { 0, 1, 0, 0, 1, 0, 1, 1, });

      glEnableClientState(GL_VERTEX_ARRAY);
      glEnableClientState(GL_TEXTURE_COORD_ARRAY);
      glBindTexture(GL_TEXTURE_2D, texture.getTextureID());
      glTexCoordPointer(2, 0, fba[1]);
      glVertexPointer(3, 0, fba[0]);
      glDrawArrays(GL_QUADS, 0, 4);
      glPopMatrix();


Oh, and I also tried ALPHA_TEST, but I also did ALPHA_TEST_FUNC too, with identical results.

Offline Freeky

Senior Newbie


Medals: 1



« Reply #4 - Posted 2013-09-07 14:06:20 »

I've had this exact same problem. (thread)
When initializing your OpenGL, you should put the folowing 2 lines in:
1  
2  
glAlphaFunc(GL_GREATER, 0.1f);
glEnable(GL_ALPHA_TEST);

This will tell openGL not to write pixels with a depth (equal to or) lower than 0.1 to the depth buffer and will thus solve your problem.

I hope it helps, it worked for me.
Online wessles

JGO Wizard


Medals: 65
Projects: 4
Exp: 3 years


Radirius Software Developer


« Reply #5 - Posted 2013-09-08 03:41:11 »

Thanks! +1 medal!

Pages: [1]
  ignore  |  Print  
 
 
You cannot reply to this message, because it is very, very old.

 

Add your game by posting it in the WIP section,
or publish it in Showcase.

The first screenshot will be displayed as a thumbnail.

pw (37 views)
2014-07-24 01:59:36

Riven (38 views)
2014-07-23 21:16:32

Riven (26 views)
2014-07-23 21:07:15

Riven (28 views)
2014-07-23 20:56:16

ctomni231 (59 views)
2014-07-18 06:55:21

Zero Volt (50 views)
2014-07-17 23:47:54

danieldean (42 views)
2014-07-17 23:41:23

MustardPeter (44 views)
2014-07-16 23:30:00

Cero (60 views)
2014-07-16 00:42:17

Riven (57 views)
2014-07-14 18:02:53
HotSpot Options
by dleskov
2014-07-08 03:59:08

Java and Game Development Tutorials
by SwordsMiner
2014-06-14 00:58:24

Java and Game Development Tutorials
by SwordsMiner
2014-06-14 00:47:22

How do I start Java Game Development?
by ra4king
2014-05-17 11:13:37

HotSpot Options
by Roquen
2014-05-15 09:59:54

HotSpot Options
by Roquen
2014-05-06 15:03:10

Escape Analysis
by Roquen
2014-04-29 22:16:43

Experimental Toys
by Roquen
2014-04-28 13:24:22
java-gaming.org is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑gaming.org
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!