# Visualization Library

A lightweight C++ OpenGL middleware for 2D/3D graphics

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# D:/VL/BuildSystem/VL_DISTRO/Visualization_Library_SDK/src/vlGraphics/Billboard.cpp

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    00001 /**************************************************************************************/
    00002 /*                                                                                    */
    00003 /*  Visualization Library                                                             */
    00004 /*  http://www.visualizationlibrary.org                                               */
    00005 /*                                                                                    */
    00006 /*  Copyright (c) 2005-2010, Michele Bosi                                             */
    00007 /*  All rights reserved.                                                              */
    00008 /*                                                                                    */
    00009 /*  Redistribution and use in source and binary forms, with or without modification,  */
    00010 /*  are permitted provided that the following conditions are met:                     */
    00011 /*                                                                                    */
    00012 /*  - Redistributions of source code must retain the above copyright notice, this     */
    00013 /*  list of conditions and the following disclaimer.                                  */
    00014 /*                                                                                    */
    00015 /*  - Redistributions in binary form must reproduce the above copyright notice, this  */
    00016 /*  list of conditions and the following disclaimer in the documentation and/or       */
    00017 /*  other materials provided with the distribution.                                   */
    00018 /*                                                                                    */
    00019 /*  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND   */
    00020 /*  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED     */
    00021 /*  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE            */
    00022 /*  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR  */
    00023 /*  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES    */
    00024 /*  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;      */
    00025 /*  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON    */
    00026 /*  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT           */
    00027 /*  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS     */
    00028 /*  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.                      */
    00029 /*                                                                                    */
    00030 /**************************************************************************************/
    00031
    00032 #include <vlGraphics/Billboard.hpp>
    00033 #include <vlGraphics/Camera.hpp>
    00034
    00035 using namespace vl;
    00036
    00037 //-----------------------------------------------------------------------------
    00038 Billboard::Billboard()
    00039 {
    00040   setAxis(vec3(0,1,0));
    00041   setNormal(vec3(0,0,1));
    00042   mType = BT_SphericalBillboard;
    00043   VL_DEBUG_SET_OBJECT_NAME()
    00044 }
    00045 //-----------------------------------------------------------------------------
    00046 vec3 Billboard::position()
    00047 {
    00048   return localMatrix().getT();
    00049 }
    00050 //-----------------------------------------------------------------------------
    00051 void Billboard::setPosition(const vec3& pos)
    00052 {
    00053   setLocalMatrix( mat4::getTranslation(pos) );
    00054 }
    00055 //-----------------------------------------------------------------------------
    00056 void Billboard::computeWorldMatrix(Camera* camera)
    00057 {
    00058   if( assumeIdentityWorldMatrix() )
    00059   {
    00060     setWorldMatrix( mat4() );
    00061   }
    00062   else
    00063   if ( !camera )
    00064   {
    00065     Transform::computeWorldMatrix(NULL);
    00066   }
    00067   else
    00068   {
    00069     mat4 world_mat;
    00070     vec3 pos = position();
    00071     if (parent() && !parent()->assumeIdentityWorldMatrix())
    00072       pos = parent()->worldMatrix() * pos;
    00073     if ( type() == BT_SphericalBillboard )
    00074     {
    00075       // eye positional
    00076       world_mat.setZ( (camera->modelingMatrix().getT() - pos).normalize() );
    00077       world_mat.setY( camera->modelingMatrix().getY() );
    00078       world_mat.setX( cross(world_mat.getY(), world_mat.getZ()) );
    00079       world_mat = vl::mat4::getTranslation(pos) * world_mat;
    00080
    00081       // eye directional
    00082       //world_mat.setZ( camera->modelingMatrix().getZ() );
    00083       //world_mat.setY( camera->modelingMatrix().getY() );
    00084       //world_mat.setX( camera->modelingMatrix().getX() );
    00085       //world_mat = vl::mat4::getTranslation(pos) * world_mat;
    00086     }
    00087     else
    00088     if ( type() == BT_AxisAlignedBillboard )
    00089     {
    00090       vec3 normal = mNormal;
    00091       vec3 bill_to_eye = (camera->modelingMatrix().getT() - pos).normalize();
    00092       // flatten on the plane defined by the axis()
    00093       normal      = normal      - axis() * dot(normal,      axis());
    00094       bill_to_eye = bill_to_eye - axis() * dot(bill_to_eye, axis());
    00095       normal.normalize();
    00096       bill_to_eye.normalize();
    00097       world_mat = vl::mat4::getTranslation(pos) * mat4::getRotation(normal,bill_to_eye);
    00098     }
    00099
    00100     setWorldMatrix( world_mat );
    00101   }
    00102 }
    00103 //-----------------------------------------------------------------------------

Visualization Library v2011.09.1162 Reference Documentation
Copyright 2005-2011 Michele Bosi. All rights reserved.
Updated on Thu Jan 26 2012 00:43:36.
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