 | | | clicking and Dragging models around a terrain | clicking and Dragging models around a terrain 2003-12-17 - By Jerry McManus
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Judging by the comments in the code he is actually using Y as the up vector,
not X. Not sure which one is 'cooler'. The variables p and v are vectors used
to position the model in world space, but you are only making a calculation
based on the first component which is X, and that would explain why you are only
getting movement in the X axis.
Cheers,
Jerry
-- -- Original Message -- --
From: <welchc@(protected)>
To: <dir3d-l@(protected)>
Sent: Tuesday, December 16, 2003 10:47 AM
Subject: [Dir3d-l] clicking and Dragging models around a terrain
>
> I've been trying to figure out how to click and drag models around a
> surface. I will eventually add a terrain follow script to the dragged
> object so it sticks to the surface. But, right now I'm having difficulty
> canniblising a script by Alex da Franca (constainDrag.dir). He is using X
> as the up axis. (It seems all the 'cool' coders use X up). So, I, not being
> as cool as the others, need Z to be my up axis. I can almost make it work
> but the model only moves along the y and not the x (or maybe its the other
> way around). I don't want the model to go up or down (Z) as I will have the
> terrain follow script deal with that.
>
> I've pasted the script below. Could someone take a look at it and maybe
> point out where I am going wrong or point me in the right direction?
> Thanks!--Carl
>
> property pSprite, pMember
> property pLeftTop
> property pCam
> property pModel
> property pOffset -- offset from clickloc to clicked models worldpos
>
> on beginSprite me
> pSprite = sprite(me.spriteNum)
> pMember = pSprite.member
> pLeftTop = point(pSprite.left, pSprite.top)
> pCam = pSprite.camera
> pModel = void
> end beginSprite
>
> on mouseDown me
> pModel = pCam.modelunderloc((the clickloc - pLeftTop))
> if ilk(pModel) = #model then
> if pModel.name <> "terrain" then
> pOffset = (the clickloc - pLeftTop) - pCam.worldSpaceToSpriteSpace
> (pModel.worldposition)
> else
> pModel = void
> end if
> end if
> end
>
>
> on mouseUp me
> pModel = void
> end
>
> on mouseUpOutside me
> pModel = void
> end
>
> on exitframe me
> if ilk(pModel) = #model then
> shift = the shiftdown
> camPos = pCam.worldposition
>
> -- if shift then vHeight = pModel.worldposition.z -- vertical drag
> -- else vHeight = pModel.worldposition.x -- horizontal drag
>
> vHeight = pModel.worldposition.x
> -- vHeight = pModel.worldposition.z
> p = pCam.spriteSpaceToWorldSpace((the mouseLoc - pLeftTop - pOffset))
>
> put "p" && P
> v = p - camPos
> -- v = camPos - p
> v.normalize()
> put "v" && v
> if shift then -- vertical drag
>
> -- if v[3] <> 0 then -- if the vector is parallel to the x-y plane we
> can't divide by 0
> -- f = (p[3] - vHeight) / v[3]
> -- newWP = p - (v * f)
> -- newWP[2] = pModel.worldposition.y
> -- pModel.worldposition = newWP
> end if
>
> else -- horizontal drag
> if v[1] <> 0 then -- if the vector is parallel to the x-z plane we
> can't divide by 0
>
> f = (p[1] - vHeight) / v[1]
> pModel.worldposition = p - (v * f)
> end if
> end if
> end if
> end
>
>
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