alpha face sorting inside single mesh? 2004-03-29 - By NoiseCrime
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-- -- Original Message -- --
From: "Mads Rydahl" <mads@(protected)>
> I have tried multiple geometrical approaches, including offsetting all 4
verts 1
> unit in z and keeping the camera close by, offsetting 1000+ units,
slanting the
> faces, so that the lower two verts are significantly in front (like this:
> /////), rotating the entire model slightly, you name it... I feel I've
tried
> everything, but I don't understand the logic at work.
As you've found out there doesn't appear to be sorting of polygons within a
mesh, which is giving you problems.
Funnily enough i just replied to a similar topic on dirgames-l, not very
funny is the bizarre observations i've made with.
I've forward the post to this list so you should find it pop up (possibly
before this one)
One problem you might have is the rebuildign of the mesh. This isn't
required and more than likely is causing the changes in the rendering order
you see. This is becuase when you build a mesh in sw3d it does some
housekeeping on the mesh in the background, and can do all manor of strange
things to your geoemtry that you'll never know about.
However i have an assumption which might help you (but if you see the
crosspost message you'll see its not qwuite as straightforward). That is
once a mesh is built the face order (i.e. the order the faces are rendered
in) should be consistant, as long as you don't rebuild it. So what you
should be able to do is sort your sprite quads, and then convert these into
the built mesh, where the furthest traingle away will be placed into the
vertex indices of the first face, then the next traingle into face 2 and so
on.
This 'should' mean you'll get the correct drawing order.
Something else to try would be splitting your sprites into groups of objects
that exist at the same depth. Each group then becomes a model and seeing as
models are drawn in sorted order that might give you some control over
layering.
Noisecrime 2004
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