【OpenGL】运用GLTriangleBatch三角形批次类创建球体、花托、圆柱圆锥体、圆盘

球体

花托

圆柱

圆盘

球体

创建球体 void gltMakeSphere(GLTriangleBatch& sphereBatch, GLfloat fRadius, GLint iSlices, GLint iStacks);

输出sphereBatch, 输入参数半径fRaidus, iSlices 是围绕球体排列的三角形对数（即列数），iStacks 是从球体底部堆叠到顶部的三角形带的数量（即行数）。

花托

void gltMakeTorus(GLTriangleBatch& torusBatch, GLfloat majorRadius, GLfloat minorRadius, GLint numMajor, GLint numMinor);

输出torusBatch，输入majorRadius是花托中心到外边缘的半径，minorRadius则是到内边缘的半径, numMajor和numMinor分别是列和行数（与iSlices和iStacks类似) 书上说是细分单元数量。

圆柱

void gltMakeCylinder(GLTriangleBatch& cylinderBatch, GLfloat baseRadius, GLfloat topRadius, GLfloat fLength, GLint numSlices, GLint numStacks);

输出cylinderBatch，输入baseRadius底部半径,topRadius顶部半径，numSlices列数，numStacks行数（注意列数和行数都是以三角对为整体的而言的），fLength是三角形长度？将一端的半径设置为0时，就变为圆锥。

圆盘

void gltMakeDisk(GLTriangleBatch& diskBatch, GLfloat innerRadius, GLfloat outerRadius, GLint nSlices, GLint nStacks);

输出diskBath，输入innerRadius内部半径和outerRadius外部半径，nSlidecs和nStacks分别是列数和行数。

// Objects.cpp
// OpenGL SuperBible, Chapter 4
// Demonstrates GLTools built-in objects
// Program by Richard S. Wright Jr.
#pragma comment(lib, "gltools.lib")#include <GLTools.h> // OpenGL toolkit
#include <GLMatrixStack.h>
#include <GLFrame.h>
#include <GLFrustum.h>
#include <GLBatch.h>
#include <GLGeometryTransform.h>#include <math.h>
#ifdef __APPLE__
#include <glut/glut.h>
#else
#define FREEGLUT_STATIC
#include <GL/glut.h>
#endif/
// An assortment of needed classes
GLShaderManager     shaderManager;
GLMatrixStack       modelViewMatrix;
GLMatrixStack       projectionMatrix;
GLFrame             cameraFrame;
GLFrame             objectFrame;
GLFrustum           viewFrustum;GLTriangleBatch     sphereBatch;
GLTriangleBatch     torusBatch;
GLTriangleBatch     cylinderBatch;
GLTriangleBatch     coneBatch;
GLTriangleBatch     diskBatch;GLGeometryTransform   transformPipeline;
M3DMatrix44f        shadowMatrix;GLfloat vGreen[] = { 0.0f, 1.0f, 0.0f, 1.0f };
GLfloat vBlack[] = { 0.0f, 0.0f, 0.0f, 1.0f };// Keep track of effects step
int nStep = 0;///
// This function does any needed initialization on the rendering context.
// This is the first opportunity to do any OpenGL related tasks.
void SetupRC()
{// Black backgroundglClearColor(0.7f, 0.7f, 0.7f, 1.0f);shaderManager.InitializeStockShaders();glEnable(GL_DEPTH_TEST);transformPipeline.SetMatrixStacks(modelViewMatrix, projectionMatrix);cameraFrame.MoveForward(-15.0f);// SpheregltMakeSphere(sphereBatch, 3.0, 10, 20);// TorusgltMakeTorus(torusBatch, 3.0f, 0.75f, 15, 15);// CylindergltMakeCylinder(cylinderBatch, 2.0f, 2.0f, 3.0f, 13, 2);// ConegltMakeCylinder(coneBatch, 2.0f, 0.0f, 3.0f, 13, 2);// DiskgltMakeDisk(diskBatch, 1.5f, 3.0f, 13, 3);
}/
void DrawWireFramedBatch(GLTriangleBatch* pBatch)
{shaderManager.UseStockShader(GLT_SHADER_FLAT, transformPipeline.GetModelViewProjectionMatrix(), vGreen);pBatch->Draw();// Draw black outlineglPolygonOffset(-1.0f, -1.0f);glEnable(GL_LINE_SMOOTH);glEnable(GL_BLEND);glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);glEnable(GL_POLYGON_OFFSET_LINE);glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);glLineWidth(2.5f);shaderManager.UseStockShader(GLT_SHADER_FLAT, transformPipeline.GetModelViewProjectionMatrix(), vBlack);pBatch->Draw();// Restore polygon mode and depht testingglPolygonMode(GL_FRONT_AND_BACK, GL_FILL);glDisable(GL_POLYGON_OFFSET_LINE);glLineWidth(1.0f);glDisable(GL_BLEND);glDisable(GL_LINE_SMOOTH);
}///
// Called to draw scene
void RenderScene(void)
{// Clear the window with current clearing colorglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);modelViewMatrix.PushMatrix();M3DMatrix44f mCamera;cameraFrame.GetCameraMatrix(mCamera);modelViewMatrix.MultMatrix(mCamera);M3DMatrix44f mObjectFrame;objectFrame.GetMatrix(mObjectFrame);modelViewMatrix.MultMatrix(mObjectFrame);shaderManager.UseStockShader(GLT_SHADER_FLAT, transformPipeline.GetModelViewProjectionMatrix(), vBlack);switch (nStep) {case 0:DrawWireFramedBatch(&sphereBatch);break;case 1:DrawWireFramedBatch(&torusBatch);break;case 2:DrawWireFramedBatch(&cylinderBatch);break;case 3:DrawWireFramedBatch(&coneBatch);break;case 4:DrawWireFramedBatch(&diskBatch);break;}modelViewMatrix.PopMatrix();// Flush drawing commandsglutSwapBuffers();
}// Respond to arrow keys by moving the camera frame of reference
void SpecialKeys(int key, int x, int y)
{if (key == GLUT_KEY_UP)objectFrame.RotateWorld(m3dDegToRad(-5.0f), 1.0f, 0.0f, 0.0f);if (key == GLUT_KEY_DOWN)objectFrame.RotateWorld(m3dDegToRad(5.0f), 1.0f, 0.0f, 0.0f);if (key == GLUT_KEY_LEFT)objectFrame.RotateWorld(m3dDegToRad(-5.0f), 0.0f, 1.0f, 0.0f);if (key == GLUT_KEY_RIGHT)objectFrame.RotateWorld(m3dDegToRad(5.0f), 0.0f, 1.0f, 0.0f);glutPostRedisplay();
}///
// A normal ASCII key has been pressed.
// In this case, advance the scene when the space bar is pressed
void KeyPressFunc(unsigned char key, int x, int y)
{if (key == 32){nStep++;if (nStep > 4)nStep = 0;}switch (nStep){case 0:glutSetWindowTitle("Sphere");break;case 1:glutSetWindowTitle("Torus");break;case 2:glutSetWindowTitle("Cylinder");break;case 3:glutSetWindowTitle("Cone");break;case 4:glutSetWindowTitle("Disk");break;}glutPostRedisplay();
}///
// Window has changed size, or has just been created. In either case, we need
// to use the window dimensions to set the viewport and the projection matrix.
void ChangeSize(int w, int h)
{glViewport(0, 0, w, h);viewFrustum.SetPerspective(35.0f, float(w) / float(h), 1.0f, 500.0f);projectionMatrix.LoadMatrix(viewFrustum.GetProjectionMatrix());modelViewMatrix.LoadIdentity();
}///
// Main entry point for GLUT based programs
int main(int argc, char* argv[])
{gltSetWorkingDirectory(argv[0]);glutInit(&argc, argv);glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH | GLUT_STENCIL);glutInitWindowSize(800, 600);glutCreateWindow("Sphere");glutReshapeFunc(ChangeSize);glutKeyboardFunc(KeyPressFunc);glutSpecialFunc(SpecialKeys);glutDisplayFunc(RenderScene);GLenum err = glewInit();if (GLEW_OK != err) {fprintf(stderr, "GLEW Error: %s\n", glewGetErrorString(err));return 1;}SetupRC();glutMainLoop();return 0;
}

【OpenGL】运用GLTriangleBatch三角形批次类创建球体、花托、圆柱圆锥体、圆盘相关推荐

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【OpenGL】运用GLTriangleBatch三角形批次类创建球体、花托、圆柱圆锥体、圆盘

球体

花托

圆柱

圆盘

【OpenGL】运用GLTriangleBatch三角形批次类创建球体、花托、圆柱圆锥体、圆盘相关推荐

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