fhRenderMatrix fhRenderMatrix::CreateLookAtMatrix( const idVec3& viewOrigin, const idVec3& at, const idVec3& up )
{
fhRenderMatrix rot = CreateLookAtMatrix( at - viewOrigin, up );
fhRenderMatrix translate;
translate[12] = -viewOrigin.x;
translate[13] = -viewOrigin.y;
translate[14] = -viewOrigin.z;
return rot * translate;
}
void Camera::compute(
const vec3 target,
const float x_view_angle,
const float y_view_angle)
{
const vec3 y = _smooth_banshee_y;
const vec3 z = _smooth_banshee_z;
const vec3 x = cross(y, z);
// camera position offset in banshee coord system
const vec3 offset(
sin(x_view_angle),
-cos(x_view_angle) * cos(y_view_angle),
cos(x_view_angle) * sin(y_view_angle) );
// set camera position
_position =
_smooth_banshee_position +
x * offset.x * _back_range +
y * offset.y * _back_range +
z * offset.z * _back_range;
_view_mat = CreateLookAtMatrix(_position, target, z);
}
Camera::Camera(
const mat4x4 start_position,
const float half_life,
const float back_range) :
_half_life(half_life),
_back_range(back_range)
{
const vec3 banshee_position(
start_position(0, 3),
start_position(1, 3),
start_position(2, 3));
const vec3 banshee_y(
start_position(0, 1),
start_position(1, 1),
start_position(2, 1));
const vec3 banshee_z(
start_position(0, 2),
start_position(1, 2),
start_position(2, 2));
_view_mat = CreateLookAtMatrix(
_position,
_position + banshee_y,
banshee_z);
_smooth_banshee_position = banshee_position;
_smooth_banshee_y = banshee_y;
_smooth_banshee_z = banshee_z;
compute(
banshee_position + banshee_y * infinity,
0,
0);
}
