Rendering Sprites Issue

Forums Technical Discussion Rendering Sprites Issue

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Oh My: Member; 7 posts; Joined: April 2013; Offline

April 18, 2013 5:34 p.m.

Hey everyone I'm trying to render out sprites and every time I do. the sprites have a black background. I want the background to be transparent, so only the image I'm using for the texture displays..

Ive attached my houdini file!

Attachments:
leafy.hipnc (245.0 KB)


laiwayne: Member; 58 posts; Joined: Sept. 2009; Offline

April 19, 2013 1:55 a.m.

In your surface shader, load the alpha from the texture and apply it to opacity

Attachments:
leafy_182.hipnc (252.4 KB)


Oh My: Member; 7 posts; Joined: April 2013; Offline

April 22, 2013 2:39 p.m.

Hey thanks. sorry i never responded but I ended up figuring out how to do that part on my own! the part I'm having trouble with now is that when I render my FX. I want the Alpha information I'm giving my sprites to render out. but the sprites all render out with the same ALPHA although i have it changing by $LIFE of the sprite

Thanks for your help laiwayne!!


Oh My: Member; 7 posts; Joined: April 2013; Offline

April 22, 2013 2:58 p.m.

To be a little more specific. I have a color node that is giving each sprite a different alpha value throughout its life. When I render my animation. All of the sprites don't read the information from the alpha channel on my color node. I only have this problem during rendering


Oh My: Member; 7 posts; Joined: April 2013; Offline

April 24, 2013 11:23 a.m.

seems like this is a common problem with no real straight forward solution


Oh My: Member; 7 posts; Joined: April 2013; Offline

April 24, 2013 11:25 a.m.

http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=25895 [sidefx.com]

I've read this post with no success in implementing it


malexander: Staff; 5158 posts; Joined: July 2005; Offline

April 24, 2013 11:51 a.m.

Try also assigning a constant color along with the alpha; perhaps adding this will help? It make not like A without RGB. </wildguess>


Oh My: Member; 7 posts; Joined: April 2013; Offline

April 24, 2013 1:15 p.m.

thanks for the reply twod. i tried your suggestion with no success.. Ive also tried placing the world Alpha in my sprite procedural with no success either


Oh My: Member; 7 posts; Joined: April 2013; Offline

April 25, 2013 1:03 a.m.

I have successfully figured it out yaaay

Attachments:
leafy.hipnc (384.7 KB)

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