pragma Warnings (Off);
pragma Style_Checks (Off);
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— GLOBE_3D.Collision_detection
—
— Copyright (c) Gautier de Montmollin 1999 .. 2008
— SWITZERLAND
—
— Permission is hereby granted, free of charge, to any person obtaining a copy
— of this software and associated documentation files (the “Software”), to deal
— in the Software without restriction, including without limitation the rights
— to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
— copies of the Software, and to permit persons to whom the Software is
— furnished to do so, subject to the following conditions:
— The above copyright notice and this permission notice shall be included in
— all copies or substantial portions of the Software.
— THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
— IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
— FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
— AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
— LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
— OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
— THE SOFTWARE.
— NB : this is the MIT License, as found 12 – Sep – 2007 on the site
— http://www.opensource.org/licenses/mit – license.php
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— Change log
—
— 21 – May – 2008 : GM : slide mode working, by adding dist_before > 0.0
— 14 – May – 2008 : GM : package created (re – used most of old Engine_3D)
package GLOBE_3D.Collision_detection is
— Reaction to an object – and the world connected to it
type Reaction_method is (elastic, slide);
type Ball_type is record
centre : Point_3D;
radius : Real;
end record;
— Collision between a ball, intending to do a step (vector), against
— an object o. If there is a collision, step is reduced in length and
— may change direction.
— Typically, the ball’s centre is the camera position and step is the camera’s
— move between two images. But the ball can be the abstraction of any moving
— object, actor, .. .
procedure Reaction (
o : Object_3D’Class;
ball : Ball_type;
method : Reaction_method;
step : in out Vector_3D; — Whole step (in : desired, out : effective)
reacted : out Real — reaction in proportion to step; in [0, 1]
);
—
Unsupported : exception; — something not yet implemented
Zero_normal, Not_one_normal : exception;
— only occur when body’s check_normals = True,
— and also when normals are wrong, of course .. .
end GLOBE_3D.Collision_detection;