OpenGL学习日记-2014.12.21--光照

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  o(╯□╰)o深患中度拖延症，也是从开始写这篇笔记到结束居然用了一个月。。。虽然中间是发生了不少事，不过明明就有无数机会可以完成，就是拖着没写代码，各种借口。。。面对如此拖延症该如何是好QAQ

正文：

突然觉得这些日记写着写着就没什么意思。。。只是简单梳理一下书中的内容，没经过很多的思考，可不写心里更虚，怕自己几天就把看的书忘了。对于很多概念，都由于没有好好去写代码验证，而理解流于表面。对于光照这章也是下决心细细琢磨一番（现在才下的决心o(╯□╰)o），毕竟这很重要。

#include "light.h"
#include "CLVector.h"

//灯塔聚光灯，
//多球:材质，变化
//对光源位置，方向的操控
//动态更新材料属性
static GLfloat light1pos[] = { 0.0, 0.0, -5.0, 0.0 };

static GLfloat light1angle = 0.0;
static GLfloat camposx = 0;

//light2 
static GLfloat light2pos[] = { 0.0, 0.0, -5.0, 1.0 }; //方向性光源
static GLfloat light2ambient[] = { 0.0, 0.0, 0.0, 1.0 }; //环境光强度
static GLfloat light2diffuse[] = { 1.0, 0.0, 0.0, 1.0 }; //散射光强度
static GLfloat light2specular[] = { 0.0, 0.0, 0.0, 1.0 }; //镜面光光强度
static GLfloat light2dir[] = { 0.0, 0.0, 1.0 };

//材料属性
GLfloat no_mat[] = { 0.0, 0.0, 0.0, 1.0 };
GLfloat mat_ambient[] = { 0.7, 0.7, 0.7, 1.0 };
GLfloat mat_ambient_color[] = { 0.8, 0.8, 0.2, 1.0 };
GLfloat mat_diffuse[] = { 1.0, 0.8, 0.8, 1.0 };
GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };
GLfloat no_shininess[] = { 0.0 };
GLfloat low_shiiness[] = { 5.0 };
GLfloat high_shininess[] = { 100.0 };
GLfloat mat_emission[] = { 0.3, 0.2, 0.2, 0.0 };//发射颜色
GLfloat mat_emission_blue[] = { 0.0, 0.2, 1.0, 0.0 };//发射颜色

void lightInit()
{
	glLightfv(GL_LIGHT0, GL_POSITION, light1pos);
	
	glEnable(GL_LIGHTING);
	glEnable(GL_LIGHT0); 

	glLightfv(GL_LIGHT1, GL_POSITION, light2pos);
	glLightfv(GL_LIGHT1, GL_SPOT_DIRECTION, light2dir);
	glLightf(GL_LIGHT1, GL_SPOT_CUTOFF, 20.0f);
	glLightfv(GL_LIGHT1, GL_AMBIENT, light2ambient );
	glLightfv( GL_LIGHT1, GL_DIFFUSE, light2diffuse );
	glLightfv( GL_LIGHT1, GL_SPECULAR, light2specular );
	glEnable(GL_LIGHT1);
}

void lightUpdate(float dt)
{
	light1angle += 0.0001;
	//if (light1angle > 360.0f)
	//{
		//light1angle = 0.0f;
	//}
	static float dir = 0.001;
	if (camposx <= -10)
	{
		dir = 0.001;
	}
	if (camposx >= 10)
	{
		dir = -0.001;
	}
	camposx += dir;
	
}

void lightDiaplay()
{
	//位置和方向
	glPushMatrix();
		glLoadIdentity();
		gluLookAt(0.0, 0.0, -30.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
		//glRotatef(light1angle, 0.0, 1.0, 0.0);
		//gluLookAt(camposx, 0.0, -30.0, camposx, 0.0, 0.0, 0.0, 1.0, 0.0);//当我们尝试去平移摄像机（沿x轴），可以明显看到效果是光在球体上掠过，说明了光源跟随了摄像机移动。光源的位置是以摄像机坐标系存储的
		glPushMatrix();
			//glRotatef( light1angle, 0.0, 10000.0, 0.0 );//这样的旋转并没用改变光轴的方向，所以显得十分奇怪
			//glTranslatef(-5.0,0.0,0.0);
			CLVector vec(light2dir[0], light2dir[1], light2dir[2]);
			vec.Rotatef(0.001, 0.0, 1.0, 0.0);
			light2dir[0] = vec.x, light2dir[1] = vec.y, light2dir[2] = vec.z;
			glLightfv(GL_LIGHT1, GL_SPOT_DIRECTION, light2dir);//光轴旋转，实现灯塔效果
			glLightfv(GL_LIGHT1, GL_POSITION, light2pos);//如果这行单独打开，对光源的位置重新设定，由于光源在世界坐标系中位置不变，而我们使摄像机平移，这时球体的光照并没有任何改变。
			//glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, light1dir);
		glPopMatrix();
		glPushMatrix();
			GLUquadricObj* qobj = gluNewQuadric(); //二次曲面对象
			glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);
			glMaterialfv( GL_FRONT, GL_DIFFUSE, mat_diffuse );
			glMaterialfv( GL_FRONT, GL_SPECULAR, no_mat );
			glMaterialfv( GL_FRONT, GL_SHININESS, no_mat );
			glMaterialfv( GL_FRONT, GL_EMISSION, no_mat );
			gluSphere(qobj, 2.0, 20, 16); //[2,2]
			
			glTranslatef( 0,8.0,0 );
			glMaterialfv(GL_FRONT, GL_AMBIENT, no_mat);
			glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
			glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
			glMaterialfv(GL_FRONT, GL_SHININESS, low_shiiness);
			glMaterialfv(GL_FRONT, GL_EMISSION, no_mat);
			gluSphere(qobj, 2.0, 20, 16); //[1,2]

			glTranslatef(-10, 0.0, 0);
			glMaterialfv(GL_FRONT, GL_AMBIENT, no_mat);
			glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
			glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
			glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);
			glMaterialfv(GL_FRONT, GL_EMISSION, no_mat);
			gluSphere(qobj, 2.0, 20, 16);//[1,3]

			glTranslatef(20, 0.0, 0);
			glMaterialfv(GL_FRONT, GL_AMBIENT, no_mat);
			glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
			glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
			glMaterialfv(GL_FRONT, GL_SHININESS, no_shininess);
			glMaterialfv(GL_FRONT, GL_EMISSION, no_mat);
			gluSphere(qobj, 2.0, 20, 16);//[1,1]

			glTranslatef(0, -8.0, 0);
			glMaterialfv(GL_FRONT, GL_AMBIENT, no_mat);
			glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
			glMaterialfv(GL_FRONT, GL_SPECULAR, no_mat);
			glMaterialfv(GL_FRONT, GL_SHININESS, no_mat);
			glMaterialfv(GL_FRONT, GL_EMISSION, no_mat);
			gluSphere(qobj, 2.0, 20, 16);//[2,1]

			glTranslatef(-20, 0.0, 0);
			glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient_color);
			glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
			glMaterialfv(GL_FRONT, GL_SPECULAR, no_mat);
			glMaterialfv(GL_FRONT, GL_SHININESS, no_mat);
			glMaterialfv(GL_FRONT, GL_EMISSION, no_mat);
			gluSphere(qobj, 2.0, 20, 16);//[2,3]

			glTranslatef(0, -8.0, 0);
			glMaterialfv(GL_FRONT, GL_AMBIENT, no_mat);
			glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
			glMaterialfv(GL_FRONT, GL_SPECULAR, no_mat);
			glMaterialfv(GL_FRONT, GL_SHININESS, no_mat);
			glMaterialfv(GL_FRONT, GL_EMISSION, mat_emission_blue);
			gluSphere(qobj, 2.0, 20, 16);//[3,3]

			glTranslatef(10.0, 0.0, 0);
			glMaterialfv(GL_FRONT, GL_AMBIENT, no_mat);
			glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
			glMaterialfv(GL_FRONT, GL_SPECULAR, no_mat);
			glMaterialfv(GL_FRONT, GL_SHININESS, no_mat);
			glMaterialfv(GL_FRONT, GL_EMISSION, mat_emission);
			gluSphere(qobj, 2.0, 20, 16);//[3,2]

			glTranslatef(10.0, 0.0, 0);
			glMaterialfv(GL_FRONT, GL_AMBIENT, no_mat);
			glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
			glMaterialfv(GL_FRONT, GL_SPECULAR, no_mat);
			glMaterialfv(GL_FRONT, GL_SHININESS, no_mat);
			glMaterialfv(GL_FRONT, GL_EMISSION, no_mat);
			gluSphere(qobj, 2.0, 20, 16);//[3,1]
		glPopMatrix();
		
	glPopMatrix();
}

OpenGL学习日记-2014.12.21--光照

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原文地址：http://blog.csdn.net/coderling/article/details/42980319