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OgreWireBoundingBox.cpp

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00001 /*
00002 -----------------------------------------------------------------------------
00003 This source file is part of OGRE
00004     (Object-oriented Graphics Rendering Engine)
00005 For the latest info, see http://www.ogre3d.org/
00006 
00007 Copyright © 2000-2002 The OGRE Team
00008 Also see acknowledgements in Readme.html
00009 
00010 This program is free software; you can redistribute it and/or modify it under
00011 the terms of the GNU Lesser General Public License as published by the Free Software
00012 Foundation; either version 2 of the License, or (at your option) any later
00013 version.
00014 
00015 This program is distributed in the hope that it will be useful, but WITHOUT
00016 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
00017 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
00018 
00019 You should have received a copy of the GNU Lesser General Public License along with
00020 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
00021 Place - Suite 330, Boston, MA 02111-1307, USA, or go to
00022 http://www.gnu.org/copyleft/lesser.txt.
00023 -----------------------------------------------------------------------------
00024 */
00025 #include "OgreStableHeaders.h"
00026 #include "OgreWireBoundingBox.h"
00027 
00028 #include "OgreSimpleRenderable.h"
00029 #include "OgreHardwareBufferManager.h"
00030 #include "OgreCamera.h"
00031 
00032 namespace Ogre {
00033     #define POSITION_BINDING 0
00034 
00035     WireBoundingBox::WireBoundingBox() 
00036     {
00037         mRenderOp.vertexData = new VertexData();
00038 
00039         mRenderOp.indexData = 0;
00040         mRenderOp.vertexData->vertexCount = 24; 
00041         mRenderOp.vertexData->vertexStart = 0; 
00042         mRenderOp.operationType = RenderOperation::OT_LINE_LIST; 
00043         mRenderOp.useIndexes = false; 
00044 
00045         VertexDeclaration* decl = mRenderOp.vertexData->vertexDeclaration;
00046         VertexBufferBinding* bind = mRenderOp.vertexData->vertexBufferBinding;
00047 
00048         decl->addElement(POSITION_BINDING, 0, VET_FLOAT3, VES_POSITION);
00049 
00050 
00051         HardwareVertexBufferSharedPtr vbuf = 
00052             HardwareBufferManager::getSingleton().createVertexBuffer(
00053                 decl->getVertexSize(POSITION_BINDING),
00054                 mRenderOp.vertexData->vertexCount,
00055                 HardwareBuffer::HBU_STATIC_WRITE_ONLY);
00056 
00057         // Bind buffer
00058         bind->setBinding(POSITION_BINDING, vbuf);
00059 
00060         // set basic white material
00061         this->setMaterial("BaseWhiteNoLighting");
00062 
00063 
00064         
00065     }
00066     
00067     WireBoundingBox::~WireBoundingBox() 
00068     {
00069         delete mRenderOp.vertexData;
00070     }
00071 
00072     void WireBoundingBox::setupBoundingBox(const AxisAlignedBox& aabb) 
00073     {
00074         // init the vertices to the aabb
00075         setupBoundingBoxVertices(aabb);
00076 
00077         // setup the bounding box of this SimpleRenderable
00078         setBoundingBox(aabb);
00079 
00080     }
00081 
00082     // Override this method to prevent parent transforms (rotation,translation,scale)
00083     void WireBoundingBox::getWorldTransforms( Matrix4* xform ) const
00084     {
00085         // return identity matrix to prevent parent transforms
00086         *xform = Matrix4::IDENTITY;
00087     }
00088     //-----------------------------------------------------------------------
00089     const Quaternion& WireBoundingBox::getWorldOrientation(void) const
00090     {
00091         return Quaternion::IDENTITY;
00092     }
00093     //-----------------------------------------------------------------------
00094     const Vector3& WireBoundingBox::getWorldPosition(void) const
00095     {
00096         return Vector3::ZERO;
00097     }
00098 
00099 
00100     void WireBoundingBox::setupBoundingBoxVertices(const AxisAlignedBox& aab) {
00101 
00102         Vector3 vmax = aab.getMaximum();
00103         Vector3 vmin = aab.getMinimum();
00104 
00105         Real sqLen = std::max(vmax.squaredLength(), vmin.squaredLength());
00106         mRadius = Math::Sqrt(sqLen);
00107         
00108         // inflate the wire bounding box just a bit so that it will set apart from
00109         //      a solid object
00110         Real maxx = vmax.x + 1.0;
00111         Real maxy = vmax.y + 1.0;
00112         Real maxz = vmax.z + 1.0;
00113         
00114         Real minx = vmin.x - 1.0;
00115         Real miny = vmin.y - 1.0;
00116         Real minz = vmin.z - 1.0;
00117         
00118         // fill in the Vertex buffer: 12 lines with 2 endpoints each make up a box
00119         HardwareVertexBufferSharedPtr vbuf =
00120             mRenderOp.vertexData->vertexBufferBinding->getBuffer(POSITION_BINDING);     
00121 
00122         Real* pPos = static_cast<Real*>(
00123             vbuf->lock(HardwareBuffer::HBL_DISCARD));
00124 
00125         // line 0
00126         *pPos++ = minx;
00127         *pPos++ = miny;
00128         *pPos++ = minz;
00129         *pPos++ = maxx;
00130         *pPos++ = miny;
00131         *pPos++ = minz;
00132         // line 1
00133         *pPos++ = minx;
00134         *pPos++ = miny;
00135         *pPos++ = minz;
00136         *pPos++ = minx;
00137         *pPos++ = miny;
00138         *pPos++ = maxz;
00139         // line 2
00140         *pPos++ = minx;
00141         *pPos++ = miny;
00142         *pPos++ = minz;
00143         *pPos++ = minx;
00144         *pPos++ = maxy;
00145         *pPos++ = minz;
00146         // line 3
00147         *pPos++ = minx;
00148         *pPos++ = maxy;
00149         *pPos++ = minz;
00150         *pPos++ = minx;
00151         *pPos++ = maxy;
00152         *pPos++ = maxz;
00153         // line 4
00154         *pPos++ = minx;
00155         *pPos++ = maxy;
00156         *pPos++ = minz;
00157         *pPos++ = maxx;
00158         *pPos++ = maxy;
00159         *pPos++ = minz;
00160         // line 5
00161         *pPos++ = maxx;
00162         *pPos++ = miny;
00163         *pPos++ = minz;
00164         *pPos++ = maxx;
00165         *pPos++ = miny;
00166         *pPos++ = maxz;
00167         // line 6
00168         *pPos++ = maxx;
00169         *pPos++ = miny;
00170         *pPos++ = minz;
00171         *pPos++ = maxx;
00172         *pPos++ = maxy;
00173         *pPos++ = minz;
00174         // line 7
00175         *pPos++ = minx;
00176         *pPos++ = maxy;
00177         *pPos++ = maxz;
00178         *pPos++ = maxx;
00179         *pPos++ = maxy;
00180         *pPos++ = maxz;
00181         // line 8
00182         *pPos++ = minx;
00183         *pPos++ = maxy;
00184         *pPos++ = maxz;
00185         *pPos++ = minx;
00186         *pPos++ = miny;
00187         *pPos++ = maxz;
00188         // line 9
00189         *pPos++ = maxx;
00190         *pPos++ = maxy;
00191         *pPos++ = minz;
00192         *pPos++ = maxx;
00193         *pPos++ = maxy;
00194         *pPos++ = maxz;
00195         // line 10
00196         *pPos++ = maxx;
00197         *pPos++ = miny;
00198         *pPos++ = maxz;
00199         *pPos++ = maxx;
00200         *pPos++ = maxy;
00201         *pPos++ = maxz;
00202         // line 11
00203         *pPos++ = minx;
00204         *pPos++ = miny;
00205         *pPos++ = maxz;
00206         *pPos++ = maxx;
00207         *pPos++ = miny;
00208         *pPos++ = maxz;
00209         vbuf->unlock();
00210     }
00211 
00212 
00213     Real WireBoundingBox::getSquaredViewDepth(const Camera* cam) const
00214     {
00215         Vector3 min, max, mid, dist;
00216         min = mBox.getMinimum();
00217         max = mBox.getMaximum();
00218         mid = ((min - max) * 0.5) + min;
00219         dist = cam->getDerivedPosition() - mid;
00220 
00221 
00222         return dist.squaredLength();
00223     }
00224 
00225 
00226 
00227 }
00228 

Copyright © 2002-2003 by The OGRE Team
Last modified Fri May 14 23:22:56 2004