利用OpenGL自编程实现球体源码——网格小demo

#include “stdafx.h“

#pragma warning（disable:4305） //禁止将单精度浮点数转化为双精度浮点数

enum Ref_Plain { XOY YOZ XOZ };

struct Vertex{
	float x y z;
};

struct HalfQuarterSphere{
	Vertex topVertex;// 1/8圆的穹顶点
	Vertex **pVertexs;//其余顶点
	int numCircles;//纬线数量
	int numLine;//经线数量连接南北两极
	float radius;//半径
};

HalfQuarterSphere hqSphere;

void generateHalfQuarterSphere（int numCir/*纬线数*/ int numLin/*经线数*/ HalfQuarterSphere &hqSphere float R）{//生成1/8球体所有的顶点
	hqSphere.numCircles = numCir;
	hqSphere.numLine = numLin;
	hqSphere.radius = R;
	hqSphere.topVertex.z = R;
	hqSphere.topVertex.x = hqSphere.topVertex.y = 0;
	//申请内存块
	hqSphere.pVertexs = new Vertex*[numCir];
	for （int i = 0; i < numCir; i++）{
		hqSphere.pVertexs[i] = new Vertex[numLin];
	}
	float cirAngleSegment = HALF_PI / （numLin - 1）;//每道纬线的间距
	float cirAngleOffset = 0;
	float zOffset = 0;
	float angleOffset = 0;
	float linAngleSegment = HALF_PI / （numCir - 1）;//每道相邻经线在XOY平面投影线的夹角

	//初始化纬线与XOZ平面的交点
	float curR = 0;
	int boundLine = numLin - 1;
	for （int i = numCir - 1; i >= 0; i--）{
		zOffset = R*sin（angleOffset）;
		//初始化当前纬线与始经线，末经线的交点
		curR = hqSphere.pVertexs[i][0].x = hqSphere.pVertexs[i][boundLine].y = sqrt（R*R - zOffset*zOffset）;
		hqSphere.pVertexs[i][0].y = hqSphere.pVertexs[i][boundLine].x = 0;
		hqSphere.pVertexs[i][0].z = hqSphere.pVertexs[i][boundLine].z = zOffset;
		cirAngleOffset = cirAngleSegment;
		//初始化当前纬线与其余经线的交点
		for（int j = 1; j < boundLine; j++）{
			hqSphere.pVertexs[i][j].x = curR*cos（cirAngleOffset）;
			hqSphere.pVertexs[i][j].y = curR*sin（cirAngleOffset）;
			hqSphere.pVertexs[i][j].z = zOffset;
			cirAngleOffset += cirAngleSegment;
		}
		angleOffset += linAngleSegment;
	}
}

void flipHalfQuarterSphere（HalfQuarterSphere &hqSphere Ref_Plain rp）{
	switch （rp）{
	case XOY://Z坐标取反
		hqSphere.topVertex.z = -hqSphere.topVertex.z;
		for （int i = 0; i < hqSphere.numCircles; i++）{
			for （int j = 0; j < hqSphere.numLine; j++）{
				hqSphere.pVertexs[i][j].z = -hqSphere.pVertexs[i][j].z;
			}
		}
		break;
	case YOZ://X坐标取反
		hqSphere.topVertex.x = -hqSphere.topVertex.x;
		for （int i = 0; i < hqSphere.numCircles; i++）{
			for （int j = 0; j < hqSphere.numLine; j++）{
				hqSphere.pVertexs[i][j].x = -hqSphere.pVertexs[i][j].x;
			}
		}
		break;
	case XOZ://Y坐标取反
		hqSphere.topVertex.y = -hqSphere.topVertex.y;
		for （int i = 0; i < hqSphere.numCircles; i++）{
			for （int j = 0; j < hqSphere.numLine; j++）{
				hqSphere.pVertexs[i][j].y = -hqSphere.pVertexs[i][j].y;
			}
		}
		break;
	}
}

void renderHalfQuarterSphere（const HalfQuarterSphere &hqSphere）{//绘制1/8球
	glBegin（GL_TRIANGLE_FAN）;//以穹点为中心画三角形扇
	glNormal3f（hqSphere.topVertex.x hqSphere.topVertex.y hqSphere.topVertex.z）;
	glVertex3f（hqSphere.topVertex.x hqSphere.topVertex.y hqSphere.topVertex.z）;
	for （int i = 0; i < hqSphere.numLine; i++）{
		glNormal3f（hqSphere.pVertexs[0][i].x hqSphere.pVertexs[0][i].y hqSphere.pVertexs[0][i].z）;
		glVertex

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     文件        6354  2019-03-12 18:18  SphereSphereCGfxOpenGL.cpp
     目录           0  2019-03-12 18:17  Sphere
     目录           0  2019-03-11 19:50  SphereDebug
     文件       56320  2019-03-12 18:16  SphereDebugSphere.exe
     文件      531596  2019-03-12 18:16  SphereDebugSphere.ilk
     文件     1371136  2019-03-12 18:16  SphereDebugSphere.pdb
     目录           0  2019-03-12 18:17  SphereSphere
     文件         411  2019-03-11 19:10  SphereSphereCGfxOpenGL.h
     目录           0  2019-03-12 18:16  SphereSphereDebug
     文件       26377  2019-03-12 18:16  SphereSphereDebugCGfxOpenGL.obj
     文件        1150  2019-03-11 19:50  SphereSphereDebugSphere.Build.CppClean.log
     文件        1791  2019-03-12 18:16  SphereSphereDebugSphere.log
     文件       17888  2019-03-12 15:56  SphereSphereDebugSphere.obj
     文件     7471104  2019-03-11 19:50  SphereSphereDebugSphere.pch
     文件        6776  2019-03-11 19:50  SphereSphereDebugSphere.res
     目录           0  2019-03-12 18:16  SphereSphereDebugSphere.tlog
     文件       14676  2019-03-12 18:16  SphereSphereDebugSphere.tlogCL.read.1.tlog
     文件        1978  2019-03-12 18:16  SphereSphereDebugSphere.tlogCL.write.1.tlog
     文件         161  2019-03-12 18:16  SphereSphereDebugSphere.tlogSphere.lastbuildstate
     文件        2040  2019-03-12 18:16  SphereSphereDebugSphere.tlogcl.command.1.tlog
     文件        1552  2019-03-12 18:16  SphereSphereDebugSphere.tloglink.command.1.tlog
     文件        3318  2019-03-12 18:16  SphereSphereDebugSphere.tloglink.read.1.tlog
     文件         706  2019-03-12 18:16  SphereSphereDebugSphere.tloglink.write.1.tlog
     文件         464  2019-03-11 19:50  SphereSphereDebugSphere.tlog
c.command.1.tlog
     文件        2584  2019-03-11 19:50  SphereSphereDebugSphere.tlog
c.read.1.tlog
     文件         202  2019-03-11 19:50  SphereSphereDebugSphere.tlog
c.write.1.tlog
     文件      240121  2019-03-11 19:50  SphereSphereDebugstdafx.obj
     文件      437248  2019-03-12 18:16  SphereSphereDebugvc120.idb
     文件      552960  2019-03-12 18:16  SphereSphereDebugvc120.pdb
     文件        2244  2019-03-11 19:09  SphereSphereReadMe.txt
     文件         716  2019-03-11 19:09  SphereSphereResource.h
............此处省略16个文件信息