void C3DCamera::unproject(const C3DViewport* viewport, Vector3* src, Vector3* dst)
{
assert(dst);
// Create our screen space position in NDC.
assert(viewport->width != 0.0f && viewport->height != 0.0f);
Vector4 screen((src->x - viewport->x) / viewport->width, ((viewport->height - src->y) - viewport->y) / viewport->height, src->z, 1.0f);
// Map to range -1 to 1.
screen.x = screen.x * 2.0f - 1.0f;
screen.y = screen.y * 2.0f - 1.0f;
screen.z = screen.z * 2.0f - 1.0f;
// Transform the screen-space NDC by our inverse view projection matrix.
getInverseViewProjectionMatrix().transformVector(screen, &screen);
// Divide by our W coordinate.
if (screen.w != 0.0f)
{
screen.x /= screen.w;
screen.y /= screen.w;
screen.z /= screen.w;
}
dst->set(screen.x, screen.y, screen.z);
}
const glm::mat4& CTransformer::getInverseModelViewProjectionMatrix() const
{
if (m_modelViewProjection.m_inverseDirty)
{
m_modelViewProjection.m_inverse = getInverseModelMatrix() * getInverseViewProjectionMatrix();
m_modelViewProjection.m_inverseDirty = false;
}
return m_modelViewProjection.m_inverse;
}
const glm::mat4& Node::getInverseViewProjectionMatrix() const
{
Scene* scene = getScene();
auto camera = scene ? scene->getActiveCamera() : nullptr;
if( camera )
{
return camera->getInverseViewProjectionMatrix();
}
static const glm::mat4 identity{1.0f};
return identity;
}
void Camera::unproject(const Viewport* viewport, float x, float y, float depth, Vector3* dst)
{
// Determine viewport coords to use.
float vpx, vpy, vpw, vph;
if (viewport)
{
vpx = viewport->getX();
vpy = viewport->getY();
vpw = viewport->getWidth();
vph = viewport->getHeight();
}
else
{
vpx = 0;
vpy = 0;
vpw = Game::getInstance()->getWidth();
vph = Game::getInstance()->getHeight();
}
// Create our screen space position in NDC.
Vector4 screen(
((float)x - (float)vpx) / (float)vpw,
((float)(vph - y) - (float)vpy) / (float)vph,
depth,
1.0f );
// Map to range -1 to 1.
screen.x = screen.x * 2.0f - 1.0f;
screen.y = screen.y * 2.0f - 1.0f;
screen.z = screen.z * 2.0f - 1.0f;
// Transform the screen-space NDC by our inverse view projection matrix.
getInverseViewProjectionMatrix().transformVector(screen, &screen);
// Divide by our W coordinate.
if (screen.w != 0.0f)
{
screen.x /= screen.w;
screen.y /= screen.w;
screen.z /= screen.w;
}
dst->set(screen.x, screen.y, screen.z);
}
