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A ridiculous phenomena ?

by ChenJian · in Torque Game Engine Advanced · 07/12/2007 (3:54 am) · 4 replies

I do not know if this is an engine bug, and the problem is:
I have a big tree(one dts file without collisions), in front of which there are some grass (one dts file without collisions), like this:

lh3.google.com/chenjianjack/RpYF4aXLiAI/AAAAAAAAADo/7kcCC8mDgAE/front.JPG?imgmax=720
When I change my view angle, a ridiculous phenomena happens--The tree seems going ahead of the grass, see below:

lh6.google.com/chenjianjack/RpYF9KXLiBI/AAAAAAAAADw/pyrLUdTRdIg/hidden.JPG?imgmax=720
Any ideas?
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Torque 3D Owner Mark Dynna
#1
07/12/2007 (8:01 am)
How do the Material entries for the tree and grass look? That might be a transparency or Z-sorting issue.

Torque Owner Andy Hodges
#2
07/12/2007 (8:17 am)
Is the grass a DTS billboard? If so, it's probably doing that because it's "turning".

Torque Owner Brian Richardson
#3
07/12/2007 (11:34 am)
I think Andy is probably right on. I'd check the DTS grass shape, maybe you just need to modify the bounding box or something to make the billboarding correct.

Torque Owner ChenJian
#4
07/12/2007 (6:17 pm)
Thanks, Mark and all, I find it do be the business of the Z-sorting issue. In my materials.cs file, I add this:
translucent = true;
translucentBlendOp = LerpAlpha;
translucentZWrite = true;
alphaRef = 100;
And the problem is gone.
Thanks again.