[Bf-committers] python mathutils api update proposal

[Martin Poirier]

How would it decide if the return value is euler or matrix? The order of argument (that seems dangerous since multiplication is not commutative).

Martin

--- On Thu, 2/3/11, Tom Edwards <contact at steamreview.org> wrote:

> From: Tom Edwards <contact at steamreview.org>
> Subject: Re: [Bf-committers] python mathutils api update proposal
> To: "bf-blender developers" <bf-committers at blender.org>
> Received: Thursday, February 3, 2011, 5:31 PM
> That is more or less what I do. There
> is no reason I can see why it 
> shouldn't happen implicitly.
> 
> On 03/02/2011 10:19, Campbell Barton wrote:
> > Euler() * 0.5, makes sense to halve rotation, but from
> reading down
> > you're mainly interested in: Euler() * Matrix().
> >
> > This could be supported, internally doing...
> >    eul = Euler()
> >    (eul.to_matrix() *
> Matrix()).to_euler(eul.order)
> >
> > I'd be interested to know if there are many other math
> libs which do
> > Euler * Matrix since there are enough de-facto
> standard with
> > C++/python libs like mathutils I rather not define new
> ones.
> >
> > On Thu, Feb 3, 2011 at 1:04 PM, Tom Edwards<contact at steamreview.org> 
> wrote:
> >> Could we please have maths operator (i.e. * / +)
> support for eulers? You
> >> can't do anything with them currently, you have to
> cast to vector then
> >> back again!
> >>
> >> On 03/02/2011 11:08, Campbell Barton wrote:
> >>> Here are some proposed changes to the
> mathutils API I'd like to make
> >>> to avoid some confusing aspects of the api
> since its now used for all
> >>> RNA math types and GameEngine I think it would
> be good to make
> >>> improvements in this area.
> >>>
> >>> Proposal:
> >>>     http://wiki.blender.org/index.php/Dev:2.5/Source/Python/Mathutils
> >>>
> >>> If this is acceptable I can make these changes
> and update scripts.
> >>>
> >>> I'm keeping a log of all mathutils changes
> since 2.4x in mathutils.c
> >>>
> >>> To get up to speed on changes so far:
> >>>
> >>> /* Note: Changes to Mathutils since 2.4x
> >>>    * use radians rather then
> degrees
> >>>    * -
> Mathutils.Vector/Euler/Quaternion(), now only take single
> >>> sequence arguments.
> >>>    * - Mathutils.MidpointVecs
> -->    vector.lerp(other, fac)
> >>>    * - Mathutils.AngleBetweenVecs
> -->    vector.angle(other)
> >>>    * - Mathutils.ProjectVecs
> -->    vector.project(other)
> >>>    * - Mathutils.DifferenceQuats
> -->    quat.difference(other)
> >>>    * - Mathutils.Slerp --> 
>   quat.slerp(other, fac)
> >>>    * - Mathutils.Rand: removed, use
> pythons random module
> >>>    * -
> Mathutils.RotationMatrix(angle, size, axis_flag, axis)
> -->
> >>> Mathutils.RotationMatrix(angle, size, axis);
> merge axis&    axis_flag
> >>> args
> >>>    * - Matrix.scalePart --> 
>   Matrix.scale_part
> >>>    * - Matrix.translationPart
> -->    Matrix.translation_part
> >>>    * - Matrix.rotationPart
> -->    Matrix.rotation_part
> >>>    * - mathutils.Matrix.Shear(plane,
> fac, size), now takes a pair of
> >>> floats for 3x3 or 4x4 shear factor.
> >>>    * - toMatrix -->   
> to_matrix
> >>>    * - toEuler -->   
> to_euler
> >>>    * - toQuat -->   
> to_quat
> >>>    * - Vector.toTrackQuat
> -->    Vector.to_track_quat
> >>>    * - Quaternion * Quaternion
> -->    cross product (not dot product)
> >>>    * - Euler.rotate(angle, axis)
> -->    Euler.rotate_axis(axis, angle)
> >>>    * - Euler.unique() *removed*, not
> a standard function only toggled
> >>> different rotations.
> >>>    *
> >>>    * moved into class functions.
> >>>    * - Mathutils.RotationMatrix
> ->    mathutils.Matrix.Rotation
> >>>    * - Mathutils.ScaleMatrix
> ->    mathutils.Matrix.Scale
> >>>    * - Mathutils.ShearMatrix
> ->    mathutils.Matrix.Shear
> >>>    * - Mathutils.TranslationMatrix
> ->    mathutils.Matrix.Translation
> >>>    * -
> Mathutils.OrthoProjectionMatrix ->   
> mathutils.Matrix.OrthoProjection
> >>>    *
> >>>    * Moved to Geometry module:
> Intersect, TriangleArea, TriangleNormal,
> >>> QuadNormal, LineIntersect
> >>>    * - geometry.Intersect
> ->    intersect_ray_tri
> >>>    * - geometry.ClosestPointOnLine
> ->    intersect_point_line
> >>>    * - geometry.PointInTriangle2D
> ->    intersect_point_tri_2d
> >>>    * - geometry.PointInQuad2D
> ->    intersect_point_quad_2d
> >>>    * - geometry.LineIntersect
> ->    intersect_line_line
> >>>    * - geometry.LineIntersect2D
> ->    intersect_line_line_2d
> >>>    * - geometry.BezierInterp
> ->    interpolate_bezier
> >>>    * - geometry.TriangleArea
> ->    area_tri
> >>>    * - geometry.QuadNormal,
> TriangleNormal ->    normal
> >>>    * - geometry.PolyFill -> 
>   tesselate_polygon
> >>>    * - geometry.BoxPack2D
> ->    box_pack_2d
> >>>    * - geometry.BarycentricTransform
> ->    barycentric_transform
> >>>    */
> >>>
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> >
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