overte/libraries/shared/src/PlaneShape.cpp
2014-04-10 11:56:17 -07:00

36 lines
1.1 KiB
C++

//
// PlaneShape.cpp
// libraries/shared/src
//
// Created by Andrzej Kapolka on 4/10/2014.
// Copyright 2014 High Fidelity, Inc.
//
// Distributed under the Apache License, Version 2.0.
// See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//
#include "PlaneShape.h"
#include "SharedUtil.h"
const glm::vec3 UNROTATED_NORMAL(0.0f, 1.0f, 0.0f);
PlaneShape::PlaneShape(const glm::vec4& coefficients) :
Shape(Shape::PLANE_SHAPE) {
glm::vec3 normal = glm::vec3(coefficients);
_position = -normal * coefficients.w;
float angle = acosf(glm::dot(normal, UNROTATED_NORMAL));
if (angle > EPSILON) {
if (angle > PI - EPSILON) {
_rotation = glm::angleAxis(PI, glm::vec3(1.0f, 0.0f, 0.0f));
} else {
_rotation = glm::angleAxis(angle, glm::normalize(glm::cross(UNROTATED_NORMAL, normal)));
}
}
}
glm::vec4 PlaneShape::getCoefficients() const {
glm::vec3 normal = _rotation * UNROTATED_NORMAL;
return glm::vec4(normal.x, normal.y, normal.z, -glm::dot(normal, _position));
}