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Hi people!
Here:
http://news.povray.org/povray.general/thread/%3Cweb.47b9887c93fc6a8bf8a489ba0%40news.povray.org%3E/
I was asking about coordinates baking.
Now I have the problem, that an object will be translated and rotated and this
couple of times:
1.: I rotate an object around <0,0,0>
2.: Then I translate it to <1,0,0>
3.: Now I'm rotating it again (again around <0,0,0>)
If I use vrotate, I need to give at step 3 the new position of my vector:
#declare MyVector_Rotation=vrotate(MyVector_Position,<10,20,30>) for example
but where is my first rotation, assigned at step 1?
How to give the vrotate my Position AND my (older) orientation?
Maybe, I have some confusing how to use the rotation vector, after using
vrotate?
After calkulating the vectors, I would give the objects the following
coordinates like this:
rotate MyVector_Rotation
translate MyVector_Position
Is that right?
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> Now I have the problem, that an object will be translated and rotated and
> this
> couple of times:
>
> 1.: I rotate an object around <0,0,0>
> 2.: Then I translate it to <1,0,0>
> 3.: Now I'm rotating it again (again around <0,0,0>)
>
> If I use vrotate, I need to give at step 3 the new position of my vector:
> #declare MyVector_Rotation=vrotate(MyVector_Position,<10,20,30>) for
> example
>
> but where is my first rotation, assigned at step 1?
>
> How to give the vrotate my Position AND my (older) orientation?
>
> Maybe, I have some confusing how to use the rotation vector, after using
> vrotate?
>
> After calkulating the vectors, I would give the objects the following
> coordinates like this:
>
> rotate MyVector_Rotation
> translate MyVector_Position
>
> Is that right?
To rotate around some arbitrary center point instead of <0,0,0>
just translate your point by the assumed center, rotate, then
move it back.
#local Point = <0.5,0.5,0>; // some point
#local CenterPoint = <1,2,3>; // center to rotate around
#local Rotation = <10,20,30>; // rotation angles
#local ResultPoint = vrotate(Point-CenterPoint,Rotation)+CenterPoint;
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"Tim Attwood" <tim### [at] comcast net> wrote:
> #local Point = <0.5,0.5,0>; // some point
> #local CenterPoint = <1,2,3>; // center to rotate around
> #local Rotation = <10,20,30>; // rotation angles
> #local ResultPoint = vrotate(Point-CenterPoint,Rotation)+CenterPoint;
This helps!!
Thanx man!!
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