SubPixel Displacement / Relief Mapping Demo

[RedBull]

The surface shader was made for 8.x

LW doesn't give direct access to many things needed for normal/tangent mapping. I have been talking to Dpont, and Marvin about a node version for some ways to improve this. Not much luck so far. I will let you know if it eventuates.

LW9 included APS which does similar things, and is faster.
But relief mapping works on non-subpatch objects, so i can turn a single poly
into many at rendertime, both have advantages.

Normal mapping is obviously much faster/crapper.

[Exception]

I actually remember a plugin like this, which I had, for lightwave, which worked reasonably well...
I don't remember if it was a surface or pixel shader... hmmm, i'll try to find it.

[erikals]

hi, prob this,
http://forums.cgsociety.org/showthread.php?t=210027
but works bad with camera-movement (pixels poping)

[Exception]

That's exactly what it was, thanks erikals.

[dpont]

Originally Posted by RedBull

...
LW doesn't give direct access to many things needed for normal/tangent mapping...

Yes, we need tangent for this, have tried a short (but not complete)
function to get tangent, and ported Fabio Policarpo algorithm,
no color map displacement and no self-shadows yet, it uses a normal
map and a depth map stored in alpha channel, it works with UV or
cubic mapping.




Denis.

[dpont]

Denis.

[Pavlov]

Interesting... will this become a surface node - and thus not Fprime compatible - or is it possible to implement such algorithm into a procedural ?

Paolo

[dpont]

This is an experimental node for surface editor,
It works only with image map, normal+depth map
and may be a color image map which could be
displaced, like the original algorithm, self-shadows could be
added but only raytraced for a given light.
No user input planed and a lot of issues to solve,
but it is fast.

Denis.

[Werner]

Originally Posted by dpont

Attachment 38391

Denis.

Awesome! can't wait to play with this.

[JamesCurtis]

Yeah, me too!! I'll be checking this posting regularly to know when it's available!!

[dpont]

Just Color output,
image map is displaced by normal/depth map,
on a simple cube x6 polygon,
it gets shadows from light.



Denis.

[tyrot]

dear dpont

amazing stuff!! now it gets shadows...how cool is that... do you have any time frame for releasing this gem?

Best

[connerh]

Wow, Denis, you never take a break, do you?

[druitre]

Wonderful, Denis. Eargerly waiting for this.

[dpont]

One day, one step,
at beginning tangent was in a short implementation,
have improved it for working with curved surfaces,
some distortions caused by mapping
which is a simple Z planar projection.
Have toggled subpatch for sphere in layout.



Denis.