mat4 Camera::getViewMatrixInverse() const {
updateVM();
mat4 inv;
if (viewMatrix_.invert(inv))
return inv;
else
return mat4::identity;
}
// This is called to set up the Camera-View
void Camera::look(float windowRatio) {
MatStack.matrixMode(MatrixStack::PROJECTION);
MatStack.loadIdentity();
updateFrustum();
MatStack.loadMatrix(getFrustumMatrix(windowRatio));
MatStack.matrixMode(MatrixStack::MODELVIEW);
MatStack.loadIdentity();
updateVM();
MatStack.loadMatrix(viewMatrix_);
}
// This is called to set up the Camera-View
void Camera::look() {
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
updateFrustum();
loadMatrix(getFrustumMatrix());
//getProjectionMatrix();
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
updateVM();
loadMatrix(viewMatrix_);
}
void Camera::setViewMatrix(const mat4& mvMat) {
mat4 inv = glm::inverse(mvMat);
// preserve the focallength
float focallength = glm::length(focus_ - position_);
// calculate world-coordinates
vec4 pos = (inv * vec4(0.f, 0.f, 0.f, 1.f));
vec4 look = (inv * vec4(0.f, 0.f, -1.f, 0.f));
vec4 focus = pos + focallength * look;
vec4 up = (inv * vec4(0.f, 1.f, 0.f, 0.f));
positionCamera(pos.xyz(), focus.xyz(), up.xyz());
updateVM();
}
mat4 Camera::getViewMatrix() const {
updateVM();
return viewMatrix_;
}
mat4 Camera::getRotateMatrix() const {
updateVM();
return viewMatrix_.getRotationalPart();
}
mat4 Camera::getViewMatrixInverse() const {
updateVM();
return glm::inverse(viewMatrix_);
}
