ManageScene.cpp
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/*This file manages the scene details, including:
o) Transforming between world and texture coordinates
o) Keeping track of the lights and camera
o) Rendering the cube geometry for the volume
*/
#include "trueeyes.h"
#include "VolumeSourceStruct.h"
#include "GL/glut.h"
//camera used for rendering
//rtsCamera ViewCamera;
//list of rendering sources
vector<VolumeSource> SourceList;
int SelectedSource = 0;
int RenderSource = 0;
float StepSize = 0.01;
bool RenderSources = false;
//size of the volume
//vector3D<float> VolumeSize = vector3D<float>(1.0, 1.0, 1.0);
float gpVolSize[3] = {1.0, 1.0, 1.0};
float gpCropMin[3] = {0.0, 0.0, 0.0};
float gpCropMax[3] = {1.0, 1.0, 1.0};
void DrawCube()
{
//This function draws the cube representing the bounds of the volume
//A fragment shader is used to perform ray-casting
//if there is no shader selected, exit
if(SelectedShader < 0)
return;
//update all of the source data
point3D<float> p;// = SourceList[RS].S.getPosition();
//SourceList[RS].pos[0] = p.x*(1.0/gpVolSize[0])+0.5;
//SourceList[RS].pos[1] = p.y*(1.0/gpVolSize[1])+0.5;
//SourceList[RS].pos[2] = p.z*(1.0/gpVolSize[2])+0.5;
for(int s=0; s<SourceList.size(); s++)
{
p = SourceList[s].S.getPosition();
SourceList[s].pos[0] = p.x*(1.0/gpVolSize[0])+0.5;
SourceList[s].pos[1] = p.y*(1.0/gpVolSize[1])+0.5;
SourceList[s].pos[2] = p.z*(1.0/gpVolSize[2])+0.5;
}
vector3D<float> MinCrop(gpCropMin[0], gpCropMin[1], gpCropMin[2]);
vector3D<float> MaxCrop(gpCropMax[0], gpCropMax[1], gpCropMax[2]);
//compute the cube size
vector3D<float> volS = vector3D<float>(gpVolSize[0], gpVolSize[1], gpVolSize[2]);
vector3D<float> s = volS*0.5;
vector3D<float> c_min = MinCrop.Times(volS) - s;
vector3D<float> c_max = MaxCrop.Times(volS) - s;
vector3D<float> t_min = MinCrop;
vector3D<float> t_max = MaxCrop;
//AttachShaderVariables();
ShaderList[SelectedShader].glProgram.UpdateGlobalUniforms();
ShaderList[SelectedShader].glProgram.BeginProgram();
//glutSolidCube(1);
glBegin(GL_QUADS);
//Z-
glTexCoord3f(t_min.x, t_min.y, t_min.z);
glVertex3f(c_min.x, c_min.y, c_min.z);
glTexCoord3f(t_min.x, t_max.y, t_min.z);
glVertex3f(c_min.x, c_max.y, c_min.z);
glTexCoord3f(t_max.x, t_max.y, t_min.z);
glVertex3f(c_max.x, c_max.y, c_min.z);
glTexCoord3f(t_max.x, t_min.y, t_min.z);
glVertex3f(c_max.x, c_min.y, c_min.z);
//Z+
glTexCoord3f(t_min.x, t_min.y, t_max.z);
glVertex3f(c_min.x, c_min.y, c_max.z);
glTexCoord3f(t_max.x, t_min.y, t_max.z);
glVertex3f(c_max.x, c_min.y, c_max.z);
glTexCoord3f(t_max.x, t_max.y, t_max.z);
glVertex3f(c_max.x, c_max.y, c_max.z);
glTexCoord3f(t_min.x, t_max.y, t_max.z);
glVertex3f(c_min.x, c_max.y, c_max.z);
//X-
glTexCoord3f(t_min.x, t_min.y, t_min.z);
glVertex3f(c_min.x, c_min.y, c_min.z);
glTexCoord3f(t_min.x, t_min.y, t_max.z);
glVertex3f(c_min.x, c_min.y, c_max.z);
glTexCoord3f(t_min.x, t_max.y, t_max.z);
glVertex3f(c_min.x, c_max.y, c_max.z);
glTexCoord3f(t_min.x, t_max.y, t_min.z);
glVertex3f(c_min.x, c_max.y, c_min.z);
//X+
glTexCoord3f(t_max.x, t_min.y, t_min.z);
glVertex3f(c_max.x, c_min.y, c_min.z);
glTexCoord3f(t_max.x, t_max.y, t_min.z);
glVertex3f(c_max.x, c_max.y, c_min.z);
glTexCoord3f(t_max.x, t_max.y, t_max.z);
glVertex3f(c_max.x, c_max.y, c_max.z);
glTexCoord3f(t_max.x, t_min.y, t_max.z);
glVertex3f(c_max.x, c_min.y, c_max.z);
//Y-
glTexCoord3f(t_min.x, t_min.y, t_min.z);
glVertex3f(c_min.x, c_min.y, c_min.z);
glTexCoord3f(t_max.x, t_min.y, t_min.z);
glVertex3f(c_max.x, c_min.y, c_min.z);
glTexCoord3f(t_max.x, t_min.y, t_max.z);
glVertex3f(c_max.x, c_min.y, c_max.z);
glTexCoord3f(t_min.x, t_min.y, t_max.z);
glVertex3f(c_min.x, c_min.y, c_max.z);
//Y+
glTexCoord3f(t_min.x, t_max.y, t_min.z);
glVertex3f(c_min.x, c_max.y, c_min.z);
glTexCoord3f(t_min.x, t_max.y, t_max.z);
glVertex3f(c_min.x, c_max.y, c_max.z);
glTexCoord3f(t_max.x, t_max.y, t_max.z);
glVertex3f(c_max.x, c_max.y, c_max.z);
glTexCoord3f(t_max.x, t_max.y, t_min.z);
glVertex3f(c_max.x, c_max.y, c_min.z);
glEnd();
ShaderList[SelectedShader].glProgram.EndProgram();
}
void DrawLights()
{
glColor3f(1.0, 0.0, 0.0);
//draw a sphere for each light
for(int l=1; l<SourceList.size(); l++)
{
glPushMatrix();
point3D<float> p = SourceList[l].S.getPosition();
glTranslatef(p.x, p.y, p.z);
glutSolidSphere(0.1, 10, 10);
glPopMatrix();
}
}