C++ opengl 绘制地面

程序运行如下：

注意：主要是法线

源码如下：

ground.h

#pragma once

#include "ggl.h"

class Ground {
public:
	void Draw();
};

ground.cpp

#include "ground.h"

void Ground::Draw() {
	glEnable(GL_DEPTH_TEST);
	glDisable(GL_TEXTURE_2D);
	glBegin(GL_QUADS);
	glNormal3f(0.0f, 1.0f, 0.0f);
	for (int z = 0; z < 20; z++) {
		float zStart = 100.0f - z*10.0f;
		for (int x = 0; x < 20; x++) {
			float xStart = x*10.0f - 100.0f;
			if ((z % 2) ^ (x % 2)) {
				glColor4ub(41, 41, 41, 255);
			}
			else {
				glColor4ub(200, 200, 200, 255);
			}
			glVertex3f(xStart, -1.0f, zStart);
			glVertex3f(xStart + 10.0f, -1.0f, zStart);
			glVertex3f(xStart + 10.0f, -1.0f, zStart - 10.0f);
			glVertex3f(xStart, -1.0f, zStart - 10.0f);
		}
	}
	glEnd();
}