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camera_chase.cpp
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camera_chase.cpp
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/************************************************************************/
/* */
/* This file is part of VDrift. */
/* */
/* VDrift is free software: you can redistribute it and/or modify */
/* it under the terms of the GNU General Public License as published by */
/* the Free Software Foundation, either version 3 of the License, or */
/* (at your option) any later version. */
/* */
/* VDrift is distributed in the hope that it will be useful, */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
/* GNU General Public License for more details. */
/* */
/* You should have received a copy of the GNU General Public License */
/* along with VDrift. If not, see <http://www.gnu.org/licenses/>. */
/* */
/************************************************************************/
#include "camera_chase.h"
CameraChase::CameraChase(const std::string & name) :
Camera(name),
offset(Direction::Up * 2 - Direction::Forward * 6),
posblend_on(true)
{
rotation.LoadIdentity();
}
void CameraChase::SetOffset(const Vec3 & value)
{
offset = value;
if (offset.dot(Direction::Forward) < 1E-3f)
{
offset = offset - Direction::Forward;
}
}
void CameraChase::Reset(const Vec3 & newfocus, const Quat & focus_facing)
{
focus = newfocus;
rotation = focus_facing;
Vec3 view_offset = offset;
rotation.RotateVector(view_offset);
position = focus + view_offset;
}
void CameraChase::Update(const Vec3 & newfocus, const Quat & focus_facing, float dt)
{
focus = newfocus;
Vec3 view_offset = offset;
focus_facing.RotateVector(view_offset);
Vec3 target_position = focus + view_offset;
float posblend = 10 * dt;
if (posblend > 1) posblend = 1;
if (!posblend_on) posblend = 1;
position = position * (1 - posblend) + target_position * posblend;
rotation = LookAt(position, focus, Direction::Up);
}