Custom Z sorting

MolokoTheMole · Post by **MolokoTheMole** » Tue Sep 25, 2007 6:03 pm

I'm having a hard time with the Irrlicht Z buffer. I'm doing mainly 2D rendering, I have to do a lot of tweaking to make it sort correctly. Also there are artifacts when using the EMT_TRANSPARENT_ALPHA_CHANNEL material.

How could I fix this? I was thinking of making my own node sorting, could I do this?

JP · Post by JP » Wed Sep 26, 2007 8:17 am

I think the node sorting should be fine, are you sure that your source image is not causing the problems? Maybe those pixels are transparent in the image?

MolokoTheMole · Post by **MolokoTheMole** » Wed Sep 26, 2007 9:28 am

Oh I should've explained how that is drawn. The arm is drawn on top of the torso. The graphics for the arms is antialiased. It looks fine against the background but on top of the torso it renders as if the background was there.

JP · Post by JP » Wed Sep 26, 2007 10:19 am

I see, certainly seems like some z sorting issues.

Can you not draw the arm after the torso? Or is that what you're doing already?

IPv6 · Post by **IPv6** » Wed Sep 26, 2007 1:57 pm

MolokoTheMole wrote:How could I fix this? I was thinking of making my own node sorting, could I do this?

Disable z buffer at all if you use 2d rendering in 3d, make your own material and mark it as transparent.

Custom sorting would be useful indeed. May be this will be added as feature sometimes.

MolokoTheMole · Post by **MolokoTheMole** » Wed Sep 26, 2007 3:14 pm

So how do I set the rendering order when I disable the z-buffer?

GnarlyHotep · Post by **GnarlyHotep** » Thu Sep 27, 2007 4:22 pm

MolokoTheMole wrote:The graphics for the arms is antialiased. It looks fine against the background but on top of the torso it renders as if the background was there.

How are you antialiasing the images? From the looks of it, it looks like a problem creating the antialiased image - instead of changing the alpha channel, the paint program is blending between a foreground color (the arm) and the background color. Different Z sorting won't change anything if that's the case.

MolokoTheMole · Post by **MolokoTheMole** » Fri Sep 28, 2007 11:01 am

No that's not the case, the images are saved in png format. They are drawn that way in a paint program.

hybrid · Post by **hybrid** » Fri Sep 28, 2007 11:22 am

So you use 2 draw2DImage calls for the screenshot shown?

MolokoTheMole · Post by **MolokoTheMole** » Fri Sep 28, 2007 1:52 pm

No those are 3d sprites, made of 4 vertices, 2 polygons.
Would drawing everything with draw2dimage solve the problem?

hybrid · Post by **hybrid** » Fri Sep 28, 2007 2:41 pm

At least it has some different settings for texture alpha layer handling. So it my be worth trying.
What's the code for drawing the two elements then? Is one a child of the other?

MolokoTheMole · Post by **MolokoTheMole** » Sat Sep 29, 2007 5:49 pm

No they are not children, would that help?

Irrlicht Engine

Custom Z sorting

Custom Z sorting

Re: Custom Z sorting