3 Replies Latest reply on Apr 12, 2007 8:20 AM by Nickname_is_none

# image 3d movement

I have some images following each other around in a circular motion. I want to add a Z dimension so that the images now follow each other in an eliptical motion, but the images get smaller as they move into the distance. How can I do this? Here is part of my current code for the movement:

if gRotateR then
currentangle = currentangle + 2
sprite(me.spriteNum).locH = (sin((currentangle + pOffset)/57.296) * circleradius) + circlecenter.locH
sprite(me.spriteNum).locV = (cos((currentangle + pOffset)/57.296) * circleradius) + circlecenter.locV
end if
• ###### 1. Re: image 3d movement
First, store sprite(me.spritenum) in a property and use that property instead, so you don't have to keep writing that out:

my = sprite(me.spritenum)

Then add: * 0.5 after circleradius for the locV line, to change from a circle to an elipse:

my.locV = (cos((currentangle + pOffset)/57.296) * circleradius * 0.5) + circlecenter.locV

Also, adjust the sprite's width and height based on a similar equation to the one you use for your locV:

my.locZ = my.locV
zScale = 1/((-cos((currentangle + pOffset)/57.296) * 0.3)+1)
my.width = my.member.width * zScale
my.height = my.member.height * zScale

And finally you'll probably want to z-sort your sprites based on their locv:

my.locZ = my.locV

Hope this helps!

- Ben
• ###### 2. Re: image 3d movement
Nickname is none wrote:
> I have some images following each other around in a circular motion.
> I want to add a Z dimension so that the images now follow each other
> in an eliptical motion, but the images get smaller as they move into
> the distance. How can I do this?

Are you asking how to make them stay the same size on screen?

refToYour3dModel.camera[1].projection=#orthographic

Andrew

• ###### 3. Re: image 3d movement
Thanks Andrew, but I want them to get smaller as they move into the distance (then get bigger when they return to the foreground).

Duckets, that's worked perfectly. The only issue I have now is that I had them dissapearing behind an image when they move into the background, but they are now rotating on totally on top of this image. How can I fix this?