alpha problem with sprites

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alpha problem with sprites #254743 03/05/09 06:37 03/05/09 06:37
Joined: Feb 2007 Posts: 353 A amy OP Senior Member
amy OP Senior Member A Joined: Feb 2007 Posts: 353	I do an alpha fade from 0% to 100% alpha. With a model entity it works without problems. With the same code a sprite entity stays invisible from 0% to 50%. This looks like a bug to me. my code: Code: void fadein(ENTITY e, var seconds) { var ticks = seconds 16; reset(e, INVISIBLE); e.alpha = 0; while(e.alpha < 100) {e.alpha = minv(e.alpha + 100/ticks * time_step, 100); wait(1);} } the TRANSLUCENT flag is set.

Re: alpha problem with sprites [Re: amy] #254745 03/05/09 07:51 03/05/09 07:51
Joined: Jul 2000 Posts: 28,024 Frankfurt jcl Chief Engineer
jcl Chief Engineer Joined: Jul 2000 Posts: 28,024 Frankfurt	http://manual.3dgamestudio.net/aentity-alpha.htm

Re: alpha problem with sprites [Re: jcl] #254746 03/05/09 07:54 03/05/09 07:54
Joined: Feb 2007 Posts: 353 A amy OP Senior Member
amy OP Senior Member A Joined: Feb 2007 Posts: 353	I don´t understand what this has to do with my problem? I don´t use alpha testing. I want to slowly fade in an entity.

Re: alpha problem with sprites [Re: amy] #254753 03/05/09 08:42 03/05/09 08:42
M mercuryus Unregistered
mercuryus Unregistered M	Has your sprite an alpha channel? (tga/dds)? GS can't handle this full fading because of some reasons.

Re: alpha problem with sprites [Re: amy] #254754 03/05/09 08:42 03/05/09 08:42
Joined: Aug 2008 Posts: 2,838 take me down to the paradise c... Cowabanga Expert
Cowabanga Expert Joined: Aug 2008 Posts: 2,838 take me down to the paradise c...	Code: function fadein() { set(my,TRANSLUCENT); while(1) { my.alpha += 5time_step if(my.alpha == 100){break; reset(my,TRANSLUCENT);} wait(1); } } Just an idea. EDIT: Or use the fade in example in the manual: Code: set(my,TRANSLUCENT); for (my.alpha=0; my.alpha+=5time_step; my.alpha<100) wait(1); reset(my,TRANSLUCENT); Last edited by Cowabanga; 03/05/09 08:50.

Re: alpha problem with sprites [Re: Cowabanga] #254756 03/05/09 08:54 03/05/09 08:54
Joined: Feb 2008 Posts: 3,232 Australia EvilSOB Expert
EvilSOB Expert Joined: Feb 2008 Posts: 3,232 Australia	Try changing the line reset(e, INVISIBLE); to be reset(e, INVISIBLE\|OVERLAY); and see if it makes a difference. "There is no fate but what WE make." - CEO Cyberdyne Systems Corp. A8.30.5 Commercial

Re: alpha problem with sprites [Re: EvilSOB] #254764 03/05/09 10:18 03/05/09 10:18
Joined: Sep 2003 Posts: 929 Spirit Moderator
Spirit Moderator Joined: Sep 2003 Posts: 929	Its just logical. You must only understand what transparency is. Either you want overlay transparency that is invisible below 50% alpha, or you want alpha transparency that is still visible below 50% alpha. Naturally you cant have both at the same time. Now you will ask "What is overlay transparency and what is alpha transparency"? Well thats why we have the Mighty Manual, just read the link that was posted as answer on your question. In your case I would just use a transparent texture, TGA or DDS, and not an overlay texture.