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Flat (undistort) projection on several 3D surface

question open graphics

CMY 20/02/12 - 10:16

Hi.

I can't understand one thing.
example: i have got flat wall and one box near, and projector over my head or some where else. i making 3d model in vvvv box and quad. Now i want to make flat (without distortion for my point view) projection on wall and box. but i don't understand how!

i can make normalized projection on flat surface using textured quad.
i can make projections on different sides of one real cube, using one projector.

But how can i make undistort projection on several 3d surfaces?

4 replies 0 new

link | Flag this reply as a solution. tonfilm (devvvv) 21/02/2012 - 00:01

how to project on 3d geometry

link | Flag this reply as a solution. CMY 21/02/2012 - 09:47

thanx, but i know this.
and i understand that "A projection onto an arbitrary surface looks undistorted (ie. exactly as being projected) when seen from the point of view of the projector."

But i don't understand how to make it.
How make projection on virtual 3d objects, like light from some point, point of view. Than i can make render for real projector (placed in another point).

or i must make many renders for each side of 3d object? but if i making projection on 10 objects * 3 sides = 30 renders. i think it too much.

link | Flag this reply as a solution. CMY 21/02/2012 - 10:12

Another example:
in path
ProjectionMapping_SimpleSetup.v4p tiki-download_file.php?fileId=1842 in "How To Project On 3D Geometry"
autor use node "Ligth" flying over the boxes. How change this node to virtual projector looking at boxes?

link | Flag this reply as a solution. Desaxismundi 21/02/2012 - 11:31

Have a look at the Projected Texture.fx inside girlpowers(slideprojector)

Also this might come handy :
hlsl-shader-question-projecting-flat-texture-on-mesh-if-it-would-be-a-2d-image

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Shoutbox

~10min ago

Urbankind: circuitb:Wrongcop is epic! :)

~50min ago

joreg: @tobi: use GetSlice() as the patch i referred you to is demonstrating. or start a forum thread with your patch.

~1h ago

TobiTobsen123: hmm yes i can see the values...but how to handle them as seperate values? I need to forward them via TCP/IP...

~2h ago

joreg: @tobi: OSCDecoder helppatch has a section: OSC_Advanced (bottomright) that demoes decoding of multiple messages

~3h ago

TobiTobsen123: I'm using an OSCDecoder, it receives two arguments...works but how can I seperate the arguments into two seperate values

~3h ago

fibo: http://leapmotion.com/

~4h ago

circuitb: http://www.wrongcops.com/watch-wrong-cops-chapter-one.php

~6h ago

u7angel: @mediadog, make it a forum question.

~6h ago

u7angel: @mediadog, tty renderer ?

~8h ago

microdee: however non-conductive objects are invisible for this so the pencil and the sticks in the video are still a mysteries