//---------------------------------------------------------------------
void Camera::getCameraToViewportRay(Real screenX, Real screenY, Ray* outRay) const
{
Matrix4 inverseVP = (getProjectionMatrix() * getViewMatrix(true)).inverse();
#if OGRE_NO_VIEWPORT_ORIENTATIONMODE == 0
// We need to convert screen point to our oriented viewport (temp solution)
Real tX = screenX; Real a = getOrientationMode() * Math::HALF_PI;
screenX = Math::Cos(a) * (tX-0.5f) + Math::Sin(a) * (screenY-0.5f) + 0.5f;
screenY = Math::Sin(a) * (tX-0.5f) + Math::Cos(a) * (screenY-0.5f) + 0.5f;
if ((int)getOrientationMode()&1) screenY = 1.f - screenY;
#endif
Real nx = (2.0f * screenX) - 1.0f;
Real ny = 1.0f - (2.0f * screenY);
Vector3 nearPoint(nx, ny, -1.f);
// Use midPoint rather than far point to avoid issues with infinite projection
Vector3 midPoint (nx, ny, 0.0f);
// Get ray origin and ray target on near plane in world space
Vector3 rayOrigin, rayTarget;
rayOrigin = inverseVP * nearPoint;
rayTarget = inverseVP * midPoint;
Vector3 rayDirection = rayTarget - rayOrigin;
rayDirection.normalise();
outRay->setOrigin(rayOrigin);
outRay->setDirection(rayDirection);
}
//----------------------------------------------------------------------------------------------------------------------
ngl::Vec3 NGLDraw::getWorldSpace(const int _x, const int _y)
{
ngl::Mat4 m;
m = m*m_mouseGlobalTX;
ngl::Mat4 t=m_cam->getProjectionMatrix();
ngl::Mat4 v=m_cam->getViewMatrix();
// as ngl:: and OpenGL use different formats need to transpose the matrix.
t.transpose();
v.transpose();
m.transpose();
ngl::Mat4 inverse=(t*v*m).inverse();
ngl::Vec4 tmp(0,0,-1.0f,1.0f);
// convert into NDC
tmp.m_x=(2.0f * _x) / m_width- 1.0f;
tmp.m_y=1.0f - (2.0f * _y) / m_height;
// scale by inverse MV * Project transform
ngl::Vec4 near(tmp.m_x,tmp.m_y,-1.0f,1.0f);
ngl::Vec4 far(tmp.m_x,tmp.m_y,1.0f,1.0f);
//get world point on near and far clipping planes
ngl::Vec4 obj_near=inverse*near;
ngl::Vec4 obj_far=inverse*far;
// Scale by w
obj_near/=obj_near.m_w;
obj_far/=obj_far.m_w;
ngl::Vec3 nearPoint(obj_near.m_x,obj_near.m_y,obj_near.m_z);
ngl::Vec3 farPoint(obj_far.m_x,obj_far.m_y,obj_far.m_z);
//create ray
ngl::Vec3 rayDir(farPoint-nearPoint);
if(rayDir.lengthSquared() == 0.0f)
{
std::cout<<"Ray Direction in getWorldSpace equals zero, can't normalise"<<std::endl;
}
else
{
rayDir.normalize();
}
//calculate distance to zx plane
float dist = (-nearPoint.m_y)/rayDir.m_y;
//set world space coordinate where y = 0
ngl::Vec3 obj(nearPoint.m_x + (dist*rayDir.m_x),nearPoint.m_y + (dist*rayDir.m_y),nearPoint.m_z + (dist*rayDir.m_z));
obj.m_y = 0.0;
return obj;
}
Ray Camera::GetScreenRay(float screenX, float screenY) const
{
Update();
Vertex3 nearPoint(screenX, screenY, -1); //in normalized device coordinates (Z goes from near = -1 to far = 1)
Vertex3 farPoint(screenX, screenY, 0); //in normalized device coordinates
Vertex3 nearWorldCoord = ScreenToWorld(nearPoint);
Vertex3 farWorldCoord = ScreenToWorld(farPoint);
Vector3 direction(farWorldCoord - nearWorldCoord);
return Ray(nearWorldCoord, direction);
}
Ray::Ray(const gfx::View* view, const gfx::ICamera* camera, const vec2& mousePos, float maxDist /*= FLT_MAX*/ )
{
const RectI& viewPort(view->getViewport());
vec2 ndc(((mousePos.x - viewPort.x) / viewPort.width) * 2.0f - 1.0f,
-((mousePos.y - viewPort.y ) / viewPort.height) * 2.0f + 1.0f);
vec4 nearPoint(ndc, 0.0f, 1.0f);
vec4 farPoint(ndc, 1.0f, 1.0f);
mat44 unproject(camera->getViewProjection().inverse());
nearPoint = unproject * nearPoint;
farPoint = unproject * farPoint;
m_Origin = nearPoint.xyz() / nearPoint.w;
m_Direction = normalize(farPoint.xyz() / farPoint.w - m_Origin);
m_MaxDistance = maxDist;
}
Ray Camera::getRay( float screenX, float screenY, Vector3* outFar ) const
{
//assert( activeView != nullptr );
if( !activeView ) return Ray();
Vector2i size = activeView->getSize();
Vector3 nearPoint(screenX, size.y - screenY, 0);
Vector3 farPoint (screenX, size.y - screenY, 1);
Vector3 rayOrigin = UnprojectViewPoint(nearPoint, activeView, this);
Vector3 rayTarget = UnprojectViewPoint(farPoint, activeView, this);
Vector3 rayDirection = rayTarget - rayOrigin;
rayDirection.normalize();
if( outFar != nullptr ) *outFar = rayTarget;
Ray pickRay(rayOrigin, rayDirection);
return pickRay;
}
//-----------------------------------------------------------------------
Ray Camera::GetCameraToViewportRay(float screenX, float screenY)
{
Ray ret;
Matrix4f inverseVP = GetProjViewMatrix().Inverse();
float nx = (2.0f * screenX) - 1.0f;
float ny = 1.0f - (2.0f * screenY);
Vector3f nearPoint(nx, ny, -1.f);
// Use midPoint rather than far point to avoid issues with infinite projection
Vector3f midPoint (nx, ny, 0.0f);
// Get ray origin and ray target on near plane in world space
Vector3f rayOrigin, rayTarget;
rayOrigin = inverseVP * nearPoint;
rayTarget = inverseVP * midPoint;
Vector3f rayDirection = rayTarget - rayOrigin;
rayDirection.Normalize();
ret.setOrigin(rayOrigin);
ret.setDirection(rayDirection);
return ret;
}
bool Polygon::hit(Point pt) const { return nearPoint(pt, Robot_Radius); }
bool Rect::hit(Point pt) const {
return nearPoint(pt, Robot_Radius);
}
