// ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
//
ofVec3f MousePosOnPlane::getMousePosOnPlane( float _mouseX, float _mouseY, ofVec3f _planeNormal, ofVec3f _pointOnPlane,
ofMatrix4x4* _modelViewMatrix, ofMatrix4x4* _projectionMatrix, ofRectangle* _viewPort )
{
ofMatrix4x4 modelViewMat;
ofMatrix4x4 projectionMat;
GLint viewport[4];
if( _modelViewMatrix == NULL ) { glGetFloatv(GL_MODELVIEW_MATRIX, modelViewMat.getPtr() ); }
else { modelViewMat.set( *_modelViewMatrix ); }
if( _projectionMatrix == NULL ) { glGetFloatv(GL_PROJECTION_MATRIX, projectionMat.getPtr() ); }
else { projectionMat.set( *_projectionMatrix ); }
if( _viewPort == NULL )
{
glGetIntegerv(GL_VIEWPORT, viewport);
}
else
{
viewport[0] = _viewPort->x;
viewport[1] = _viewPort->y;
viewport[2] = _viewPort->width;
viewport[3] = _viewPort->height;
}
float dx, dy, dz = 0.0;
ofVec3f mouseRayPosition;
ofVec3f mouseRayVector;
int ry = viewport[3] - _mouseY - 1;
gluES::gluUnProject( _mouseX, ry, 0.0,
modelViewMat.getPtr(), projectionMat.getPtr(), viewport,
&mouseRayPosition.x, &mouseRayPosition.y, &mouseRayPosition.z);
gluES::gluUnProject( _mouseX, ry, 1.0,
modelViewMat.getPtr(), projectionMat.getPtr(), viewport,
&mouseRayVector.x, &mouseRayVector.y, &mouseRayVector.z);
mouseRayVector -= mouseRayPosition;
mouseRayVector.normalize();
float planeDistance = getPlaneDistance( &_planeNormal, &_pointOnPlane );
float tmpDist = rayIntersectPlane( &_planeNormal, planeDistance, &mouseRayPosition, &mouseRayVector );
return mouseRayPosition + (mouseRayVector * tmpDist);
}
OSMAND_CORE_API bool OSMAND_CORE_CALL OsmAnd::Utilities_OpenGL_Common::lineSegmentIntersectPlane( const glm::vec3& planeN, const glm::vec3& planeO, const glm::vec3& line0, const glm::vec3& line1, glm::vec3& lineX )
{
const auto line = line1 - line0;
const auto lineD = glm::normalize(line);
float d;
if(!rayIntersectPlane(planeN, planeO, lineD, line0, d))
return false;
// If point is not in [line0 .. line1]
if(d < 0.0f || d > glm::length(line))
return false;
lineX = line0 + d*lineD;
return true;
}
