calculation mouseposition to floor
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On 15/02/2014 at 16:35, xxxxxxxx wrote:
Hey,
i looking for a way to calculate - the position on the floor where the mouse is pointing to.
i get the mouse part working and get a x y coordination - but don`t get the way to the coordinates where it break the y 0
pickrespos = bd.SW(c4d.Vector(mx,my,distance?))thanks
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On 24/02/2014 at 08:10, xxxxxxxx wrote:
No one an idea how Calculate the Pointer Direktion to floor ?
Thanks
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On 10/03/2014 at 05:03, xxxxxxxx wrote:
There are many resources for maths online.
import c4d import random def iszero(x) : r""" Returns True if *x* is near zero. """ return abs(x) < 1.0e-07 def perpendicular_vector(v) : r""" Finds an arbitrary perpendicular vector to *v*. Sort of a lazy implementation.. """ a, b = random.random(), random.random() if not iszero(v.z) : x, y, z = v.x, v.y, v.z elif not iszero(v.y) : x, y, z = v.x, v.z, v.y elif not iszero(v.x) : x, y, z = v.y, v.z, v.x else: raise ValueError('zero-vector') c = (- x * a - y * b) / z if not iszero(v.z) : return c4d.Vector(a, b, c) elif not iszero(v.y) : return c4d.Vector(a, c, b) elif not iszero(v.x) : return c4d.Vector(b, c, a) def describe_line(a, b) : r""" Returns a description of a line based on the two points *a* and *b* in space. *a* and *b* must not equal. """ assert a != b return (a, (b - a)) def is_point_on_line(line, p) : r""" Checks if the point *p* is element of the specified *line*. """ d_a = (line[0] - p).Dot(line[1]) return iszero(d_a) def describe_plane(a, b, c) : r""" Returns a description of a plane based on tree points *a*, *b* and *c* in space. *a*, *b* and *c* must not equal and *c* must not be on the same line described by *a* and *b*. """ assert a != b assert a != c assert not is_point_on_line(describe_line(a, b), c) return (a, (b - a), (c - a)) def plane_normal(plane) : r""" Returns the normal of the *plane*. """ return plane[1].Cross(plane[2]).GetNormalized() def get_plane(name) : r""" Returns the description of a plane based on the specified *name*. The following values are accepted: - *XZ*, *ZX*, *floor* - *XY*, *YX*, *front* - *YZ*, *ZY*, *right* """ name = name.lower() if name in ('xz', 'zx', 'floor') : n = c4d.Vector(0, 1, 0) elif name in ('xy', 'yx', 'front') : n = c4d.Vector(0, 0, 1) elif name in ('yz', 'zy', 'right') : n = c4d.Vector(1, 0, 0) else: raise ValueError x1 = perpendicular_vector(n) y1 = x1.Cross(n).GetNormalized() return describe_plane(x1, y1, c4d.Vector(0)) def find_intersection(line, plane) : r""" Finds the intersection of the *line* and *plane*. Returns None if the line does not intersect the plane or is element of it. """ n = plane_normal(plane) d_a = (plane[0] - line[0]).Dot(n) d_b = line[1].Dot(n) if iszero(d_a) or iszero(d_b) : # No intersection or line is part of the plane. return None return line[0] + (d_a / d_b) * line[1] from c4d import Vector as V line = describe_line(V(100), V(-100)) plane = get_plane('floor') print find_intersection(line, plane)Cheers,
-Niklas