# Visualization Library

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

[Home] [Tutorials] [All Classes] [Grouped Classes]

- Main Page
- Related Pages
- Namespaces
- Classes
- Files

- File List
- File Members

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

Go to the documentation of this file.

    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/ClipPlane.hpp>
    00033
    00034 using namespace vl;
    00035
    00036 //-----------------------------------------------------------------------------
    00037 ClipPlane::ClipPlane(real o, vec3 n)
    00038 {
    00039   VL_DEBUG_SET_OBJECT_NAME()
    00040   mPlane.setNormal(n);
    00041   mPlane.setOrigin(o);
    00042 }
    00043 //-----------------------------------------------------------------------------
    00044 ClipPlane::ClipPlane(const vec3& o, const vec3& n)
    00045 {
    00046   VL_DEBUG_SET_OBJECT_NAME()
    00047   mPlane.setNormal(n);
    00048   mPlane.setOrigin(dot(o, n));
    00049 }
    00050 //-----------------------------------------------------------------------------
    00051 void ClipPlane::apply(int index, const Camera* camera, OpenGLContext*) const
    00052 {
    00053   VL_CHECK(index>=0 && index<6);
    00054
    00055   // we do our own transformations
    00056
    00057   if (camera)
    00058   {
    00059     glEnable(GL_CLIP_PLANE0 + index);
    00060
    00061     glMatrixMode(GL_MODELVIEW);
    00062     glPushMatrix();
    00063
    00064     glLoadIdentity();
    00065
    00066     mat4 mat;
    00067     if ( boundTransform() )
    00068       mat = camera->viewMatrix() * boundTransform()->worldMatrix();
    00069
    00070     vec3 pt1 = mPlane.normal() * mPlane.origin();
    00071     vec3 pt2 = mPlane.normal() * mPlane.origin() + mPlane.normal();
    00072
    00073     pt1 = mat * pt1;
    00074     pt2 = mat * pt2;
    00075
    00076     vec3 n = pt2 - pt1;
    00077     real orig = dot(n, pt1);
    00078
    00079 #if defined(VL_OPENGL_ES1)
    00080     float equation[] = { n.x(), n.y(), n.z(), -orig };
    00081     glClipPlanef(GL_CLIP_PLANE0 + index, equation);
    00082 #else
    00083     double equation[] = { n.x(), n.y(), n.z(), -orig };
    00084     glClipPlane(GL_CLIP_PLANE0 + index, equation);
    00085 #endif
    00086
    00087     glPopMatrix();
    00088   }
    00089   else
    00090   {
    00091     glDisable(GL_CLIP_PLANE0 + index);
    00092   }
    00093 }
    00094 //-----------------------------------------------------------------------------

Visualization Library v2011.09.1162 Reference Documentation
Copyright 2005-2011 Michele Bosi. All rights reserved.
Updated on Thu Jan 26 2012 00:43:36.
Permission is granted to use this page to write and publish articles regarding Visualization Library.