Given 2 points A(x0,y0,z0) and C(x2,y2,z2) forming a segment of length "k", what is the equation to find a point C(x1,y1,z1) placed at "k-1" distance from A?
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问题:
回答1:
This is basic maths. If you already have classes handling vectors and points, you should be able to do something like this:
Vector direction = C - A;
direction.Normalize();
Point newpoint = A + (k-1) * direction;
You just need
difference between points (gives a vector)
scalar product of a float with a vector (gives a new vector)
addition of a point and a vector (gives a new point)
回答2:
Smells like homework, so, general idea, but no code:
Get the slope of AC for each coordinate set (x, y, and z). Then progress k-1 units from A at each of the calculated slope to get the coordinates of the new point.