[Papervision3D] Project a material on a 3D object using a constant 2D POV

Thu Apr 24 07:01:43 PDT 2008

As i understand it, Tim (Knip) is looking at implementing projected
materials in an upcoming version of PV3D

for those of you who want the feature now, The Away3d engine can provide it!
You need to use a TransformBitmapMaterial, and set the projectionVector
property to a Number3D object representing the axis of projection. The
resulting texture renders as fast as regular uv textures.

http://away3d.googlecode.com/svn/trunk/src/away3d/materials/TransformBitmapMaterial.as

a demo explaining this technique will soon be available from away3d.com

atb

Rob

On Thu, Apr 24, 2008 at 10:44 AM, Cristi Vrabete <vrabete at yahoo.com> wrote:

> I have a similar semisolved issue, but I don't like the solution, I have
> the feeling some of the more experienced guys in how 3D actually gets
> rendered would have done this way lot better than me:
>
> I want to project an image to a .dae object that spins, so that when it's
> projected it kind of looks the same, but when it spins, it moves away,
> distorted, naturally. It's actually 99% like "laser-ing" in a projecting
> movie on a surface, removing the projection and leaving the object material
> "laser-ed".
>
> The way I do this is awful and 80-90% accurate only: I parse the
> projectable image pixel by pixel, see where the pixel hitTests my model
> material and draw a pixel at those coordinates (actually I use a painful
> drawing algorithm, because 4 adiacent pixels can project in the same spot or
> many pixels apart, leaving me with a skattered image).
>
> However, this solution does the trick for my needs, but:
> 1. it's extremely slow, imagine a 500x500 image parsed like that, tested
> for hitTest on every pixel, drawing again every pixel and so on.
> 2. the resulting image is kind of blurry, depending on the object zoom,
> overdistorted on tight vertex areas, and "broken" on edges if it gets
> projected over the .dae model exactly where the movie material gets to
> reunite its edges.
>
> http://www.checkout.ro/projectiontest/
>
> click on the sphere and wait for 2-5 minutes, click dismiss all if the
> case, it's not the optimized version, but you can see my point. it looks
> like it gets stuck, but optimized and divided into smaller calculation
> parts, it takes about 1 minute to complete (still too long)
>
> If anyone has a clue on how to achieve this exact same effect the "smart"
> way, please let me know, I'm clueless on triangle bitmap calculations and
> that sort...
>
> Thank you,
> Cristi
>
>
>
> --- On Wed, 4/23/08, Tom Richardson <kwarismian at gmail.com> wrote:
>
> > From: Tom Richardson <kwarismian at gmail.com>
> > Subject: Re: [Papervision3D] Project a material on a 3D object using a
> constant 2D POV
> > To: papervision3d at osflash.org
> > Date: Wednesday, April 23, 2008, 10:34 PM
> > Because it sounds like you want to do some sort of 2d effect
> > on a 3d scene
> > (in other words, you are attempting to manipulate the
> > "results" of your 3d
> > projection, rather than include something 2d IN a 3d
> > projection), it leaves
> > you with two major options-
> >
> > 1)Use the current effects branch, and compound your effects
> > that way, using
> > render layers.
> >
> > 2)Apply some sort of effect to the end result of the
> > viewport.  Much like
> > everything else display related in flash, PV3D scenes
> > eventually boil down
> > to a single movieclip.  Do some sort of effect/modification
> > on this "end
> > result" movieclip and you should be able to get your
> > effect.
> >
> > If I have a little time I'll make an example of option
> > 2 tomorrow.  Option
> > one is fairly well illustrated in Andy Zupko's
> > "Borg Cube" effects branch
> > example tutorial.  You'll just need to start a few
> > steps short of the end
> > result.
> >
> > Good luck!
> >
> > On Wed, Apr 23, 2008 at 10:17 PM, EricJB
> > <dr.zaius at gmail.com> wrote:
> >
> > > I have been searching for a way to project my
> > movieMaterial onto the
> > > object so that no matter how the object rotates, the
> > material always keeps
> > > its coordinates with respect to the camera or view.
> > I've been looking into
> > > manipulating the uv coordinates and playing with the
> > face3D object, but I'm
> > > coming up short with everything I try. Perhaps the
> > material can be applied
> > > to the view itself and only the pixels where the do3d
> > are will show the
> > > material... anyone have any suggestions or ideas?
> > I'm trying to create a
> > > hologram like effect, so I would always want the
> > horizontal fluttering lines
> > > of the movieMaterial to stay horizontal. I hope I
> > described it well enough,
> > > my brain is melting dealing with this lately :) Thanks
> > for the help. I've
> > > been scouring the forum but I'm not getting
> > anywhere. -Eric
> > > ------------------------------
> > > View this message in context: Project a material on a
> > 3D object using a
> > > constant 2D
> > POV<
> http://www.nabble.com/Project-a-material-on-a-3D-object-using-a-constant-2D-POV-tp16838443p16838443.html
> >
> > > Sent from the Papervision3D mailing list
> > archive<http://www.nabble.com/Papervision3D-f22855.html>at
> > Nabble.com.
> > >
> > > _______________________________________________
> > > Papervision3D mailing list
> > > Papervision3D at osflash.org
> > >
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> > >
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>
>
>
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-- 
Rob Bateman
Flash Development & Consultancy

rob.bateman at gmail.com
www.infiniteturtles.co.uk
www.away3d.com
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