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2D pixels into 3D point cloud?

Name: Anonymous 2011-11-27 5:27

How do I convert 2d isometric sprite into a 3d model?

Name: Anonymous 2011-11-27 5:45

You want to turn a bitmap image into a 3d representation of that image? You'd have to do that manually.

Name: Anonymous 2011-11-27 5:48

>>2
No! These jews do that automatically:
http://www.wisdom.weizmann.ac.il/~vision/By_Example_Reconstruction/

But they dont want to share source code. I dont understand their crappy integral set theory bullshit.

Name: Anonymous 2011-11-27 5:49

>>3
Basically, I need just one side of sprite, then I could just easily it in blender.

Name: Anonymous 2011-11-27 5:53



        /|
       / |
      /  |
     /   |
    /    |
   /     |
  /|     |
 / |     |
*--|-----|(cx,0)
 `\|(x,y)|
  \|\    |
   \ `\  |
    \  `\|
     \   |(cx,cy)
      \  |
       \ |
        \|

Name: Anonymous 2011-11-27 5:54

Create 2D texture. Put sprite in texture. Create 3D billboard mesh of 4 vertices. Load 3D billboard mesh. Render 3D billboard with 2D texture.

Name: Anonymous 2011-11-27 5:54

>>5
Is that a new Star of David ASCII?

Name: Anonymous 2011-11-27 5:56

>>6
It doesnt work. I just get a rotated distorted sprite.

And the sprite is shaded: some parts are lighter, some darker (depending on relation to light source point).

Name: Anonymous 2011-11-27 6:05

>>7

it is projecting points on a plane onto a different plane. You do it by scaling the vector. If you know the depth from the camera for every single pixel in the sprite, then:

make a rectangular mesh, one vertex for every pixel.
park dat rectangular mesh next to da cam. Lets have it so like the z coordinate is the depth. Lets park the rectangular mesh so that it's coordinates look like (x,y,1).
Suppose ya know what the z coordinate of a point on the model should be for a pixel. Suppose it is c.
Then take that vector (x,y,1) and scale it by c to get (cx,cy,c). There ya go!
No supposen you don't know what this c is. Like you don't know what the z coordinate of the point on the model is, but you know how far away that point is from the camera.
Then pythag that shit bro: you know d and d = \sqrt((cx)^2 + (cy)^2 + c^2). Now solve for the c in terms of d x and y bra.

Name: Anonymous 2011-11-27 6:07

>>9
dat da so like ya supposen bro bra

Name: Anonymous 2011-11-27 6:14

>>9
please, define "solve".

also, how do you use light source to determine surface bumps?

Name: Anonymous 2011-11-27 6:22

>>11

oh, so you don't know what the depth is yet, and you are trying to infer the depth of the image by getting relative depths by looking for shadows and shiny stuff. Good luck with that bro. solve:


d = \sqrt((cx)^2 + (cy)^2 + c^2)
d^2 = (cx)^2 + (cy)^2 + c^2
d^2 = (x^2 + y^2 + 1)c^2
c^2 = (d^2)/(x^2 + y^2 + 1)
c = \sqrt((d^2)/(x^2 + y^2 + 1))
c = d/\sqrt(x^2 + y^2 + 1)

Name: Anonymous 2011-11-27 6:23

oh, so you don't know what the depth is yet
I know depth. It's 32-bit per pixel.

c^2 = (d^2)/(x^2 + y^2 + 1)
Is that C++?

Name: Anonymous 2011-11-27 6:31

>>13

Then you just gotta reproject that shit back into 3d space bro.

Now supposes that ya have a model in space, an you like to make image. Err, you like to make flat. Supposen you looking at model directly down the z axis. If you want model flat, then divide each point by z coordinate. Each point from (x, y, z) over to (x/z, y/z, 1). An now it flat. But you want to make it unflat now. So, multiply by z coordinate. You know z coordinate? You don't? You know depth? You know x/z? You know y/z? Then calculate z coordinate. z = d/sqrt((x/z)^2 + (y/z)^2 + 1) You do that. Scale it z. now (x/z, y/z, 1) be like (x, y, z). Back to original! But original no exist! It only in head! you see?

Name: Anonymous 2011-11-27 7:17

Hey, >>1
I have this excellent paper on it describing everything!

http://www.wisdom.weizmann.ac.il/~vision/By_Example_Reconstruction/BP06_HASSNER_T.pdf

Name: Anonymous 2011-11-27 7:35

>>15
But they dont want to share source code. I dont understand their crappy integral set theory bullshit.

Name: Anonymous 2011-11-27 8:01

>>16
Just email the authors and courteously ask them to share the code.

Name: Anonymous 2011-11-27 8:36

>>17
They probably already sold for use in some proprietary package.

Name: Anonymous 2011-11-27 9:09

>>16
So how can you use the code if you don't understand it? You either learn integral set theory or you cannot do what you want.

Name: Anonymous 2011-11-27 9:10

>>15
.il

Name: Anonymous 2011-11-27 9:42

Read http://www.fanfiction.net/u/2970142/

Name: Anonymous 2011-11-27 10:28

>>19
Some time ago I decompiled Cryo's (http://en.wikipedia.org/wiki/Cryo_Interactive) sprite format DLL. It had very complicated blitting code, so I had no understanding, but managed to use it as a black box decoder.

Name: Anonymous 2011-11-27 12:52

Here is an example of two complicated Scheme function, for translating between isometry and view coords. There is no need to know how they were derived to use them. They just work!

(define (map-to-view xy)
  (let ([x (vector-ref xy 0)]
        [y (vector-ref xy 1)])
    (vector (- (* x (/ tile-w 2)) (* y (/ tile-w 2)))
            (- (* x (/ tile-h 2)) (* y (/ tile-h 2))))))

(define (view-to-map xy)
  (let ([x (vector-ref xy 0)]
        [y (vector-ref xy 1)])
    (vector (/ (+ (* y tile-w) (* x tile-h))
               (* tile-w tile-h))
            (/ (- (* y tile-w) (* x tile-h))
               (* tile-w tile-h)))))

Name: Anonymous 2011-11-27 13:03

>>23
Lisp is nice

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>>33
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