Possible to render objects in front of others?

disanti · Post by **disanti** » Wed Jan 25, 2006 4:21 am

Hello,

I'm wondering if it is possible to render a 3d object in front of another 3d object no matter what the ZBuffer says. I tried disabling the ZBuffer material flag, it worked, however all the faces were inverted after that (as if that flag flips normals).

So I'm wondering if there is a way to force a 3d object on top of another... Multi-pass rendering? I don't know, some suggestions?
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HEMP

Eternl Knight · Post by **Eternl Knight** » Wed Jan 25, 2006 5:04 am

That flag doesn't flip normals, but without ZBuffering the triangles rendered in an arbitrary order and not culled. So it is not "flipping" the normals but rendering all triangles on top of each other without regard for depth.

What you need to do is clear the ZBuffer such as via the following snippet of code...

Code: Select all

device->getVideoDriver()->clearZBuffer();

--EK

disanti · Post by **disanti** » Wed Jan 25, 2006 5:36 am

Awesome! ^_^ I'll get to it! thanks
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WEED VAPORIZER

disanti · Post by **disanti** » Wed Jan 25, 2006 5:43 am

Darn it! It isn't working...

Code: Select all

	// render delayed default objects

	CurrentRendertime = ESNRP_SOLID_LAST;

	DelayedSolidNodeList.sort(); // sort by textures

	for (i=0; i<DelayedSolidNodeList.size(); ++i)
	{
		Driver->clearZBuffer();
		DelayedSolidNodeList[i].node->render();
	}

	DelayedSolidNodeList.clear();

Sometimes it works and draws on top of everything... other times... well... it doesn't work!

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Rambler american specifications

Eternl Knight · Post by **Eternl Knight** » Wed Jan 25, 2006 6:08 am

Doesn't work as in "renders as if ZBuffer is still there" or doesn't work as in "Nothing is rendered"?

A demo executable/source might help me here...

--EK

disanti · Post by **disanti** » Wed Jan 25, 2006 6:32 am

ZBuffer is still there... I don't really know how I can help anymore... I simply modified irrlicht to have another render state: ESNRP_SOLID_LAST, and I posted the code to render it. Everything else is in order.
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Motorcycle Tires

Pazystamo · Post by **Pazystamo** » Wed Jan 25, 2006 10:01 am

If your model has transparent texture then it uses z buffer...

afecelis · Post by **afecelis** » Wed Jan 25, 2006 10:07 pm

@Disanti: are you using tga files for your billboards?

disanti · Post by **disanti** » Thu Jan 26, 2006 12:37 am

@Pazystamo: No transparency, dunno where you got that idea...
@Afecelis: I'm not using billboards... where did you get that idea?

afecelis · Post by **afecelis** » Thu Jan 26, 2006 2:21 am

hehehe, sorry! I got cross-confussed with the grass node info I was reading on the "project announcements" thread.

An idea of rendering one billboard in front of another crossed my mind and then I thought I could be the tga bug.

sRc · Post by **sRc** » Thu Jan 26, 2006 2:51 am

afecelis wrote:An idea of rendering one billboard in front of another crossed my mind and then I thought I could be the tga bug.

yeah you're the TGA bug alright afecelis

Guest · Post by **Guest** » Thu Jan 26, 2006 11:12 am

Then try this http://irrlicht.sourceforge.net/phpBB2/ ... php?t=9990 It works for me....

afecelis · Post by **afecelis** » Thu Jan 26, 2006 12:36 pm

looooooooool!

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