same here,
the thing with displacement speed vs normal/parallax reminds of bump in XSI:
its a sensitive balance, where the pre-render time for displacement can slow
things down, but in general drawing the tiles (the actual rendering) is
faster with displacement as opposed to bump.
It also depends how small / sharp you want your detail. I tried a
landscape/terrain situation and given the sharp and defined result you get
easily with parallax, it was more performant than displacement, that would
have to be pushed to pretty stupid levels to get the same sharpness.
Gene, you will need both parallax and zbump, follow the rendertree example
in the XSbase thread to find out what does what. If you dont modify the
normals, the lighting will not react, and you ll hardly see the result.
I found that you should think of 50percent gray as your baselevel, (as
opposed to black for displacement) or add a color correction node with 0.5
level to offset the height. With black as your "flat" level you get
artifacts.
Other than that, its a breeze creating your height patterns combining all
kindsa shaders and nodes in the rendertree,
and then splitting it to the bump (=height) and normal inputs of the
parallax shader. I never cared much for zbump before, but found out this
works so much more intuitive than XSI's bumps.
----- Original Message -----
From: "Harry BARDAK" <harry(at)def2shoot.com>
To: <XSI(at)Softimage.COM>
Sent: Monday, December 26, 2005 11:56 AM
Subject: Re: relief/parallax mapping
Same observations but parralax mapping needed less memory when I tested
last time.
loganittos a écrit :
> Heyas Gene,
>
> Ive been playing with normal/parallax and displacements for the past 2
> week at work for a near future job and i got the parallax shader
> working. it works great, especially with zbump plugged on normal.
> i couldnt get it to work with the normalmap node on (xsi's) It is
> thou, a bit slow but there is no comparsion between it and normal
> maps. parallax is much much better. In one shot i tested them i can
> say that displacements are faster than the parallax thou but not in
> all cases it will all depend on the light you have plugged in.
>
> Its the best reference model isnt it? having all the models in your
> scene actually being images in ultra low geometry. replace the image
> and you have a new model on:)
>
> allright mate see ya soon:)
>
> Saludos
>
> Mario
>
> ----- Original Message -----
> *From:* Gene Crucean <mailto:genecrucean(at)gmail.com>
> *To:* XSI(at)Softimage.COM <mailto:XSI(at)Softimage.COM>
> *Sent:* Sunday, December 25, 2005 5:44 PM
> *Subject:* Re: relief/parallax mapping
>
> Yeah that's the parallax shader I was referring to. Relief mapping
> is different btw... http://www.infiscape.com/doc/parallax_mapping.pdf
>
> I finally got a little time last night to play with that shader
> and I can't seem to get it to work. Anyone have any success? I
> also played with the relief mapping plugin for max and I must say
> that it's pretty damn nice. Fast too.
>
>
>
> On 12/25/05, *peter_b* <peter_b(at)skynet.be
> <mailto:peter_b(at)skynet.be>> wrote:
>
> I imagine your knew this one allready:
>
http://www.xsibase.com/forum/index.php?board=12;action=display;threadid=1949
7
>
<http://www.xsibase.com/forum/index.php?board=12;action=display;threadid=194
97>
>
> your relief example below looks exactly like parallax mapping
> to me.
> there's some small thingies with it, but overall Im very
> impressed with what this can do.
>
>
>
>
>
> ----- Original Message -----
> *From:* Gene Crucean <mailto:genecrucean(at)gmail.com>
> *To:* XSI(at)Softimage.COM <mailto:XSI(at)Softimage.COM>
> *Sent:* Sunday, December 25, 2005 1:07 AM
> *Subject:* relief/parallax mapping
>
> I was talking with a friend about this today (yes I know
> it's Christmas eve) and started wondering if there are any
> technical differences between relief and parallax shaders.
> Maybe I'm way off but I've been under the impression that
> they are one in the same, just with different names. I'm
> probably behind in my learning with this so feel free to
> slap me with the old school stick. I need to do some
> testing with the parallax shader anyway.
>
> FYI...
> http://www.chaosgroup.com/forum/phpBB2/viewtopic.php?t=13906
> <http://www.chaosgroup.com/forum/phpBB2/viewtopic.php?t=13906>
>
> Check out the difference between these two.
>
> Normal map:
> http://www.visualboo.com/misc/render_scene_normal.jpg
>
> Relief:
> http://www.visualboo.com/misc/render_scene_relief.jpg
>
>
> Merry Christmas guys!
>
>
> --
> -gc
>
>
>
>
> --
> -gc
>
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