FLASH: Basic calculations for a 3D-thing in Flash

[Timm Kekeritz]

Hi Martin


You want to know the secret?

here it is:


The 3D thing is based on these formulas:


Here the calculation for "3D to 2D" transformation:

y= distance object -> screen

d= distance screen -> viewer

"screen_y" = ../:d* z_new/y

"screen_x" = ../:d* x_new/y


Turn around the z-abscissa:

 "x_new" = (../:cos_yaw * x_old) - (../:sin_yaw * y_old)

 "y_new" = (../:sin_yaw * x_old) + (../:cos_yaw * y_old)

 "z_new" = z_old


Turn around the y-abscissa:

 "x_new" = (../:cos_roll * x_old) - (../:sin_roll * z_old)

 "y_new" = y_old

 "z_new" = (../:sin_roll * x_old) + (../:cos_roll * z_old)



Turn around the x-abscissa:

 "x_new" = x_old

 "y_new" = (../:cos_pitch * y_old) - (../:sin_pitch * z_old)

 "z_new" = (../:sin_pitch * y_old) + (../:cos_pitch * z_old)


That's all you need to know...

I won't publish the .fla-file, 'cause it shouldn't be too easy for the developers

out there!

With the .fla-file, there wouldn't be any didactic effect...

But if you have a question, ask me!


greetings from germany


yours timm

DRMRLPLSaol [dot] com

 wrote:


> Timm,

>

> So are you going to reveal the secret or the source or keep it locked up?

>

> Andrew

>

>  >>In a message dated 12/1/00 4:22:12 PM Eastern Standard Time,

>

>>Timm [dot] KekeritzIconMedialab [dot] com writes:

>  >>

>  >><< Hey ho flash freaks out there...

>  >>

>  >>  I've build a quite simple but kewl flash 3D-editor... it's possible to

>  >>set

>  >>the

>  >>  amount of points, the starting position of these points and the rotation

>  >>speed

>  >>  and direction...

>  >>

>  >>  check it out, and tell what you think about it!

>  >>

>  >>  http://www.sucello.de

>  >>

>  >>  greetings

>  >>

>  >>  timm



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