Make camera zoom and rotate around object

[foq]

This has been asked before - and not answered. So..

"Is there any easy way to duplicate the sort of camera rotation found in
Director's 3D preview window? -That is, where horizontal mouse movement rotates
the camera around the world's Y axis and vertical movement rotates around a Z
axis that's relative to the camera (or something... eh, like longitude and
latitude lines on a globe)."

I am trying to make a model visualizer, and the orbit camera and rotate
objects behaviours are not very convincing...

Thank you very much for any help.

[otterman]

Heres some code I hacked out to control horizontal rotation. Will give you an
idea at least

Hope it helps




on mousewithin me

--the middle of the image
myImageMiddle = sprite(me.spriteNum).width/2
myImageLength = the mouseH - sprite(me.spriteNum).left

if the mouseDown then
tempDist = (sprite(5).camera.worldPosition).magnitude
if tempDist > 500.00 then --crop tempDist to max
tempDist = 500.00-- this is max distance to consider
end if

tempFactor = tempDist / 500.00--calculate scaling factor
tempX = (the mouseH-prevMouseH)*tempFactor*2--edit 2 to alter speed

-- THIS BIT TO TELL WHERE TO PIVOT
sprite(5).camera.rotate(0,tempX,0,#WORLD)
end if

prevMouseH = the mouseH
end

[necromanthus]

[q]Originally posted by: ]foq
"Is there any easy way to duplicate the sort of camera rotation found in
Director's 3D preview window? -That is, where horizontal mouse movement rotates
the camera around the world's Y axis and vertical movement rotates around a Z
axis that's relative to the camera (or something... eh, like longitude and
latitude lines on a globe)."

I am trying to make a model visualizer, and the orbit camera and rotate
objects behaviours are not very convincing...[/q]

Study this example:
[url]http://necromanthus.com/Games/ShockWave/tutorials/PanCamera.html[/url]
For "Zoom In / Zoom Out" just translate the camera on its "X" axis.
cheers

[foq]

Thank you both for your ideas. Otterman, I will check out your code later.
Necromanthus, I´ll take a look at it as well, although in your example the
camera is rotating around its own axis. Plus, isn´t FOV a better way to make
zoom? By translating the camera, one could pass through the object being
visualized...

Again, thank you so much.

Best.

[necromanthus]

[q]Originally posted by: foq
Necromanthus, I´ll take a look at it as well, although in your example the
camera is rotating around its own axis.[/q]

There're 2 starting options. Use the second one (Targeted)


[q]Originally posted by: foq
Plus, isn´t FOV a better way to make zoom? By translating the camera, one
could pass through the object being visualized...[/q]

It's an option (but probably is not the best one).
You should try them both to see the visual result.
After that ... it's up to you.

[foq]

Oops. sorry for that.. there IS a target mode... I just realized that one second after re-visiting your site.

It looks great, by the way. Should be just what I need.

Thank you very much.

[necromanthus]

[q]Originally posted by: foq
Oops. sorry for that.. there IS a target mode... I just realized that one
second after re-visiting your site.

It looks great, by the way. Should be just what I need.

Thank you very much.[/q]
There is something more:
Q = Zoom In and A = Zoom Out
have fun

[foq]

I coulnd´t find the Zoom In and Out you´re talking about, but managed to get it
done using FOV.

(something like:)
pCamera.fieldOfView = pCamera.fieldOfView - dx

I guess that´s it, for the moment. Thank you so much.