Le 16/06/2011 21:43, Curtis Jensen a écrit :
On Wed, Jun 15, 2011 at 12:01 PM, Luc Maisonobe<[email protected]> wrote:
Le 15/06/2011 19:57, Curtis Jensen a écrit :
The Vector2D and Vector3D classes have dotProduct and crossProduct
methods. I assume this is done be considering each vector originating
There is no crossProduct in Vector2D in the current version I think.
You are correct. It was sloppy typing on my part to include
crossProduct with Vector2D.
from the origin. How can the dot product and cross products be
calculated for vectors not centered at the origin?
Yes, these methods are intended for vectorial spaces, not affine spaces,
which implies they work for vector centered at origin.
We discussed on the dev list about having separate classes for
Affine/Vectorial spaces and finally decided to merge everything in only one
class per dimension. This is a classical choice and the user often already
know what his instances represent.
What is the suggested way of getting the dot and cross products for
vectors not centered at the origin? ie. the dot product of a corner
of a polygon.
Something along these lines:
Vector3D edge12 = vertex2.subtract(vertex1);
Vector3D egge23 = vertex3.subtract(vertex2);
double dot = edge12.dotProduct(edge23);
Luc
Thanks,
Curtis
Luc
Thanks,
Curtis
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