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With respect Antoine, and at the risk of sounding pedantic, those terms
are not entirely synonymous, and while<br>
I'm sure you have a grasp of the different techniques I'll try and
explain the differences. <br>
<br>
For starters normal maps can be used for more than just texture.<br>
While you can use normal maps on a model for "bumps", they are
inherently 3 dimensional as appose to a bump maps 1 dimension.<br>
That is to say they describe the direction of a pixel, contra it's (one
dimensional) displacement above or below a given surface.<br>
While monochromatic bump maps create variation in a reference face
during lighting calcs, normals don't necessarily require a reference
face and can<br>
simulate geometry in a lighting model where no geometry exists at all.<br>
<br>
To illustrate, here's a 2D image with a normal map applied. Because is
contains the direction of each pixel, <br>
it is possible to simulate lighting even though there is no geometry
involved whatsoever, or 3d engine for that matter.<br>
<a class="moz-txt-link-freetext" href="http://www.videometry.net/ARdemo/normalMapper.html">http://www.videometry.net/ARdemo/normalMapper.html</a><br>
(and the normal map used: <a class="moz-txt-link-freetext" href="http://www.videometry.net/ARdemo/norms.png">http://www.videometry.net/ARdemo/norms.png</a>)<br>
<br>
Granted in that example the normals were pre-calculated from a 3d model,<br>
so here's the same filter applied to a simple photograph of an empty
room <br>
<a class="moz-txt-link-freetext" href="http://www.videometry.net/ARdemo/normalMapperRoom.html">http://www.videometry.net/ARdemo/normalMapperRoom.html</a><br>
(normal map drawn freehand in photoshop:
<a class="moz-txt-link-freetext" href="http://www.videometry.net/ARdemo/3dplacementRoom_norms.png">http://www.videometry.net/ARdemo/3dplacementRoom_norms.png</a>)<br>
<br>
How would you do that with a bump map?<br>
While normal maps can do bump mapping, bump maps don't have enough info
on there own to calculate normals. <br>
<br>
Antoine Azar wrote:
<blockquote cite="mid:B545D9BD-7600-42CF-ABCC-281C6C881942@2xmlabs.com"
type="cite">Nice demo, but to clarify what you say, normal mapping IS
bump mapping.
<div><br>
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<div><br>
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<div align="left"><font face="Arial" size="2">Antoine Azar</font></div>
<div align="left"><font face="Arial" size="2">2XM Labs</font></div>
<div align="left"><font face="Arial" size="2">645 Wellington W.</font></div>
<div align="left"><font face="Arial" size="2">Montreal, Quebec</font></div>
<div align="left"><font face="Arial" size="2">H3C 1T2, Canada</font></div>
<div align="left"><font face="Arial" size="2">T. 514-606-4821</font></div>
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<br>
<div>
<div>On 3-Jul-09, at 2:44 PM, Peter Strømberg wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">
<div bgcolor="#ffffff" text="#000000"> There's one difference that
hasn't been mentioned, but has proven to be of paramount importance to
me, <br>
at least for product presentation, and that is normal mapping. <br>
Away has it, PV does not yet, though I've heard it mentioned a few
times.<br>
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://away3d.com/away3d-normal-mapped-bust">http://away3d.com/away3d-normal-mapped-bust</a><br>
<br>
Don't confuse this with bump mapping, as I've seen people do. Normal
mapping makes a low poly model <br>
look like a high poly model, and the only "hit" is an extra bitmap in
the materials stack.<br>
While bump maps and normal maps can add detail, normal mapping has the
appearance to adding geometry,<br>
especially to large smooth, rounded surfaces, not to mention nipples.<br>
<br>
For more info and examples google "Normal Mapping"<br>
<br>
Cheers,<br>
Pete(2)<br>
<br>
andysk8er wrote:
<blockquote cite="mid:24306699.post@talk.nabble.com" type="cite">
<pre wrap="">Okay, I have been researching this and I can't find a definitive answer. What
is the main difference between PV3D and Away3D? Don't give me a bunch of
nebulous statements like "Papervision has more shaders" or "Away handles
Interactive materials better" or "PV is faster." What I really want to know
is this:
WHAT WAS EACH ENGINE BUILT FOR?
It looks like PV3D has a broad feature set that was intended mostly for
websites, applications and viewers.
Away looks like it was designed with making 3D games and game environments
in mind.
Is this true or am I off the mark? I don't really care about things like
"Away has a torus as a native object." I'm really just curious which engine
fits a certain type of project better than another. If I have a project
spec, how can I decide which engine to use?
I'm not trying to start any arguments about the engines. I'm very familiar
with Papervision and have built several projects in it. I haven't used
Away3D, but I'm starting to think that a few of it's features may be helpful
for a game I am designing in my spare time. Any advice from anyone here?
Thanks,
Andy.
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PETER MCATOMINEY STRØMBERG
hyperGIS ApS
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PETER MCATOMINEY STRØMBERG
hyperGIS ApS
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8200 Århus N
Denmark
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