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DarkBASIC Professional Discussion / Set vector orientation by another vector

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Brightside_
6
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Joined: 27th Oct 2013
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Posted: 14th Dec 2019 14:09
There is array of normalized vectors (points on sphere)

now i need to set their orientation by another vector ( for example objects normal ) which is also normalized (-1 to 1)

I read that first of all I need to create rotation matrix from normal and then rotate original vectors with it.
But how should i do this in DBPro?
Phaelax
DBPro Master
16
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Joined: 16th Apr 2003
Location: Metropia
Posted: 28th Dec 2019 18:19
I think I understand what you're trying to do. In the first pic, store the difference between the normalized sphere vectors and the normal of the plane. Then in the second pic when the plane's normal is shifted, adjust the sphere vectors by those stored offsets in regards to the plane's new normal. Don't overthink the problem, I think this can be solved with just simple vector subtraction/addition.

If you need to find the normal of the plane, make two segments that lie on it and take the cross product of them. Given the plane ABCD, take AB * AD and normalize the result.
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Latch
13
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Joined: 23rd Jul 2006
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Posted: 7th Jan 2020 17:51 Edited at: 7th Jan 2020 20:47
Hi,

I wonder if you can just use NEWXVALUE() , NEWYVALUE() and NEWZVALUE() commands. This is assuming you just want to rotate the vectors by some angle that you know.
Enjoy your day.
Brightside_
6
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Joined: 27th Oct 2013
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Posted: 17th Jan 2020 06:37
Thanks!
Yes, adding to vectors works fine.Like this:

Last thing I need is to add object's direction.I've orient my sphere to object normal,its works fine, but this object can be rotated so I have to add its direction too.
I try to add object direction to its normals and obviously it doesnt work

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