koobas.hobune.stream
"How far to the local left/right is another object"?
The title pretty much sums it up. I need to inplement a bit of code which will check the distance from object A to object B, but only on one axis: the local x axis of object A.
I guess the answer is simple, yet I'm a bit confused.
http://docs.unity3d.com/ScriptReference/Vector3.Project.html
You need to project a vector of (B - A) onto A's X-axis from the direction of (presumably) A's Z-axis as the normal.
Ok, I'm back and I seem to miss something. Vector3.Project uses two numbers (Direction and Normal). But this sollution requires three (Direction B-A, A.x and A.z). How should it look in the code?
Sorry, I suppose I did kind've overstate it.
Vector projection is based on the idea that a vector (i.e. B - A) is projected onto another vector (A's local X-axis). The Z-axis, being perpendicular to the X-axis, would inherently be the part removed by this projection.
For instance:
// (B - A)
Vector3 distBetween = (B.transform.position - A.transform.position);
// A's local X-Axis
Vector3 xAxis = A.transform.right;
// Vector projection on A's Z-Axis (assu$$anonymous$$g the Y-Axis isn't a factor
Vector3 xAxisDist = Vector3.Project(distBetween, xAxis);
If the Y-axis is factored in and is not desired, you could ins$$anonymous$$d set the Y value in "distBetween" to 0.
Eno Khan's comment, after a few tweaks, works fine!
Vector projection is based on the idea that a vector (i.e. B - A) is projected onto another vector (A's local X-axis). The Z-axis, being perpendicular to the X-axis, would inherently be the part removed by this projection.
For instance:
// (B - A)
Vector3 distBetween = (B.transform.position - A.transform.position);
// A's local X-Axis
Vector3 xAxis = A.transform.right;
// Vector projection on A's Z-Axis (assuming the Y-Axis isn't a factor
Vector3 xAxisDist = Vector3.Project(distBetween, xAxis);
If the Y-axis is factored in and is not desired, you could instead set the Y value in "distBetween" to 0.
