| 1 | /********************************************************************************
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| 2 | * Volatile - Volume Visualization Software for SAGE
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| 3 | * Copyright (C) 2004 Electronic Visualization Laboratory,
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| 4 | * University of Illinois at Chicago
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| 5 | *
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| 6 | * All rights reserved.
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| 7 | *
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| 8 | * Redistribution and use in source and binary forms, with or without
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| 9 | * modification, are permitted provided that the following conditions are met:
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| 10 | *
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| 11 | * * Redistributions of source code must retain the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer.
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| 13 | * * Redistributions in binary form must reproduce the above
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| 14 | * copyright notice, this list of conditions and the following disclaimer
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| 15 | * in the documentation and/or other materials provided with the distribution.
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| 16 | * * Neither the name of the University of Illinois at Chicago nor
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| 17 | * the names of its contributors may be used to endorse or promote
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| 18 | * products derived from this software without specific prior written permission.
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| 19 | *
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| 20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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| 21 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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| 22 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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| 23 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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| 24 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 25 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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| 26 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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| 27 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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| 28 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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| 29 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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| 30 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 31 | *
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| 32 | * Direct questions, comments etc about Volatile to www.evl.uic.edu/cavern/forum
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| 33 | *********************************************************************************/s
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| 34 |
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| 35 | #include "vCut.h"
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| 36 | #include "MatrixMath.h"
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| 37 | #include "global.h"
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| 38 |
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| 39 | vCut::vCut() {
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| 40 | }
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| 41 |
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| 42 |
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| 43 |
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| 44 | //called from textures draw
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| 45 | void vCut::setTransform(float objectXform[]) {
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| 46 | float temp[3];
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| 47 | temp[0]=objectXform[0]*global.cut.axis[0]+
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| 48 | objectXform[4]*global.cut.axis[1]+objectXform[8]*global.cut.axis[2];
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| 49 | temp[1]=objectXform[1]*global.cut.axis[0]+
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| 50 | objectXform[5]*global.cut.axis[1]+objectXform[9]*global.cut.axis[2];
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| 51 | temp[2]=objectXform[2]*global.cut.axis[0]+
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| 52 | objectXform[6]*global.cut.axis[1]+objectXform[10]*global.cut.axis[2];
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| 53 | computeMatrix(global.cut.angle,temp,&global.cut.transform[0]);
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| 54 | }
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| 55 |
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| 56 |
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| 57 | void vCut::disable() {
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| 58 | glDisable(GL_CLIP_PLANE0);
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| 59 | }
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| 60 |
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| 61 | void vCut::enable() {
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| 62 | global.cut.user[0] = -global.cut.transform[0];
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| 63 | global.cut.user[1]=global.cut.transform[1];
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| 64 | global.cut.user[2]=-global.cut.transform[2];
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| 65 |
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| 66 | // fprintf(stderr,"cut plane %f %f %f %f\n",global.cut.user[0],global.cut.user[1],
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| 67 | // global.cut.user[2], global.cut.user[3]);
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| 68 | //create the points for the corners of the clip plane
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| 69 | for (int ii=0;ii<4;ii++){
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| 70 | plane[ii*3+0]=global.cut.transform[0]*global.cut.user[3];
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| 71 | plane[ii*3+1]=-global.cut.transform[1]*global.cut.user[3];
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| 72 | plane[ii*3+2]=global.cut.transform[2]*global.cut.user[3];
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| 73 | plane[ii*3+0]-=global.cut.transform[4]*((ii<2)?0.5f:-0.5f);
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| 74 | plane[ii*3+1] +=global.cut.transform[5]*((ii<2)?0.5f:-0.5f);
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| 75 | plane[ii*3+2]-=global.cut.transform[6]*((ii<2)?0.5f:-0.5f);
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| 76 | plane[ii*3+0]-=global.cut.transform[8]*((ii&0x1)?-0.5f:0.5f);
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| 77 | plane[ii*3+1]+=global.cut.transform[9]*((ii&0x1)?-0.5f:0.5f);
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| 78 | plane[ii*3+2]-=global.cut.transform[10]*((ii&0x1)?-0.5f:0.5f);
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| 79 | }
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| 80 |
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| 81 | //configure the clip planes
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| 82 | glClipPlane(GL_CLIP_PLANE0,global.cut.user);
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| 83 | glEnable(GL_CLIP_PLANE0);
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| 84 | }
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| 85 |
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| 86 | void vCut::draw() {
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| 87 | glEnable(GL_TEXTURE_3D);
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| 88 | glDepthMask(GL_FALSE);
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| 89 | glPolygonMode(GL_FRONT, GL_LINE);
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| 90 | glPolygonMode(GL_BACK, GL_LINE);
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| 91 | glBegin(GL_QUADS);
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| 92 | glVertex3fv(&plane[0]);
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| 93 | glVertex3fv(&plane[3]);
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| 94 | glVertex3fv(&plane[9]);
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| 95 | glVertex3fv(&plane[6]);
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| 96 | glEnd();
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| 97 | glDepthMask(GL_TRUE);
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| 98 |
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| 99 | glDisable(GL_ALPHA_TEST);
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| 100 | glDisable(GL_TEXTURE_3D);
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| 101 |
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| 102 | glBegin(GL_LINES); //draw clip plane
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| 103 | glColor3f(1.0f,0.0f,0.0f);
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| 104 | glVertex3fv(&plane[0]);
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| 105 | glVertex3fv(&plane[3]);
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| 106 | glVertex3fv(&plane[3]);
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| 107 | glVertex3fv(&plane[9]);
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| 108 | glVertex3fv(&plane[9]);
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| 109 | glVertex3fv(&plane[6]);
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| 110 | glVertex3fv(&plane[6]);
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| 111 | glVertex3fv(&plane[0]);
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| 112 | glEnd();
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| 113 | }
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