《基于MFC的OpenGL编程》Part 16 Reflection-优快云博客

本文介绍了一种使用OpenGL创建简单反射效果的方法。通过调整物体的绘制方式，并使中间表面变得半透明，可以有效地模拟反射现象。文章提供了具体的代码示例，包括设置光源参数和绘制场景的函数。

Reflections

Adding reflections to a program too can improve its realism to a great extent. Here we'll look at a simple method to create reflection where we simply redraw the object with an appropriate transformation and make the surface in between translucent. This creates an effective illusion of reflection!!

1,设置光源代码修改如下：

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void CCY457OpenGLView::SetupLighting ()

{

//Material Properties

GLfloat matSpecular[] = { 1.0f, 0.0f, 0.0f, 0.7f};

GLfloat matShininess[] = { 50.0f};

GLfloat matAmbient[] = { 0.25f, 0.25f, 0.25f, 0.7f};

GLfloat matDiffuse[] = { 0.5f, 0.5f, 0.5f, 0.7f};

glMaterialfv(GL_FRONT, GL_SPECULAR, matSpecular);

glMaterialfv(GL_FRONT, GL_SHININESS, matShininess);

glMaterialfv(GL_FRONT, GL_DIFFUSE, matDiffuse);

glMaterialfv(GL_FRONT, GL_AMBIENT, matAmbient);

//Lighting Parameters

//Enable Lighting

glEnable(GL_LIGHTING);

//Specify a single directional light

GLfloat ambient1[] = { 0.5f,0.5f,0.5f};

GLfloat diffuse1[] = { 0.5f,0.5f,0.5f};

GLfloat specular1[] = { 1.0f,0.0f,0.0f};

GLfloat position1[] = { 0.0f,0.0f,5.0f,0.0};

glLightfv(GL_LIGHT0, GL_AMBIENT, ambient1);

glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse1);

glLightfv(GL_LIGHT0, GL_SPECULAR, specular1);

glLightfv(GL_LIGHT0, GL_POSITION, position1);

glEnable(GL_LIGHT0);

//Specify a single positional spotlight

GLfloat ambient2[] = { 1.0f,1.0f,0.0f};

GLfloat diffuse2[] = { 1.0f,0.0f,0.0f};

GLfloat position2[] = { 1.0f,0.0f,5.0f,1.0};

GLfloat direction2[] = {0.0f,0.0f,-5.0f};

glLightfv(GL_LIGHT1, GL_AMBIENT, ambient2);

glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuse2);

glLightfv(GL_LIGHT1, GL_POSITION, position2);

glLightfv(GL_LIGHT1, GL_SPOT_DIRECTION, direction2);

glLightf(GL_LIGHT1, GL_SPOT_CUTOFF, 15.0f);

glEnable(GL_LIGHT1);

}

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2,绘制函数修改如下：

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void CCY457OpenGLView::RenderScene ()

{//绘制函数

glTranslatef(0.0f,0.0f,-8.0f);

// Save matrix state and do the rotation

glPushMatrix();

glRotatef(m_xRot, 1.0f, 0.0f, 0.0f);

DrawCube();

glPopMatrix();

glPushMatrix();

glTranslatef(0.0f, -3.0f, 0.0f);

glScalef(1.0f, -1.0f, 1.0f);

glRotatef(m_xRot, 1.0f, 0.0f, 0.0f);

DrawCube();

glPopMatrix();

// Draw bottom of floor

glEnable(GL_BLEND);

glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

glPushMatrix();

glEnable(GL_TEXTURE_2D);

glBindTexture(GL_TEXTURE_2D, m_Texture[3]);

glBegin(GL_POLYGON);

glTexCoord2f(0.0f, 0.0f);

glVertex3f(-5.0f, -1.5f, 5.0f );

glTexCoord2f(1.0f, 0.0f);

glVertex3f(-5.0f, -1.5f, -5.0f );

glTexCoord2f(1.0f, 1.0f);

glVertex3f(5.0f, -1.5f, -5.0f );

glTexCoord2f(0.0f, 1.0f);

glVertex3f(5.0f, -1.5f, 5.0f );

glEnd();

glPopMatrix();

glDisable(GL_TEXTURE_2D);

glDisable(GL_BLEND);

}

void CCY457OpenGLView::DrawCube ()

{

glEnable(GL_TEXTURE_2D);

glBindTexture(GL_TEXTURE_2D,m_Texture[0]);

//Front Face

glBegin(GL_POLYGON);

glTexCoord2f(0,0);

glVertex3f(-1.0f,-1.0f,0.0f);

glTexCoord2f(1,0);

glVertex3f( 1.0f,-1.0f,0.0f);

glTexCoord2f(1,1);

glVertex3f( 1.0f, 1.0f,0.0f);

glTexCoord2f(0,1);

glVertex3f(-1.0f, 1.0f,0.0f);

glEnd();

//Back Face

glBegin(GL_POLYGON);

glTexCoord2f(1,0);

glVertex3f(-1.0f,-1.0f,-1.0f);

glTexCoord2f(1,1);

glVertex3f(-1.0f, 1.0f,-1.0f);

glTexCoord2f(0,1);

glVertex3f( 1.0f, 1.0f,-1.0f);

glTexCoord2f(0,0);

glVertex3f( 1.0f,-1.0f,-1.0f);

glEnd();

glBindTexture(GL_TEXTURE_2D,m_Texture[1]);

//Left Face

glBegin(GL_POLYGON);

glTexCoord2f(1,0);

glVertex3f(-1.0f,-1.0f, 0.0f);

glTexCoord2f(1,1);

glVertex3f(-1.0f, 1.0f, 0.0f);

glTexCoord2f(0,1);

glVertex3f(-1.0f, 1.0f,-1.0f);

glTexCoord2f(0,0);

glVertex3f(-1.0f,-1.0f,-1.0f);

glEnd();

//Right Face

glBegin(GL_POLYGON);

glTexCoord2f(0,0);

glVertex3f(1.0f,-1.0f, 0.0f);

glTexCoord2f(1,0);

glVertex3f(1.0f,-1.0f,-1.0f);

glTexCoord2f(1,1);

glVertex3f(1.0f, 1.0f,-1.0f);

glTexCoord2f(0,1);

glVertex3f(1.0f, 1.0f, 0.0f);

glEnd();

glBindTexture(GL_TEXTURE_2D,m_Texture[2]);

//Top Face

glBegin(GL_POLYGON);

glTexCoord2f(0,0);

glVertex3f(-1.0f, 1.0f, 0.0f);

glTexCoord2f(0,1);

glVertex3f( 1.0f, 1.0f, 0.0f);

glTexCoord2f(1,1);

glVertex3f( 1.0f, 1.0f, -1.0f);

glTexCoord2f(1,0);

glVertex3f(-1.0f, 1.0f, -1.0f);

glEnd();

//Botton Face

glBegin(GL_POLYGON);

glTexCoord2f(0,1);

glVertex3f(-1.0f, -1.0f, 0.0f);

glTexCoord2f(0,0);

glVertex3f(-1.0f, -1.0f, -1.0f);

glTexCoord2f(1,0);

glVertex3f( 1.0f, -1.0f, -1.0f);

glTexCoord2f(1,1);

glVertex3f( 1.0f, -1.0f, 0.0f);

glEnd();

glDisable(GL_TEXTURE_2D);

}

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本文转自Phinecos(洞庭散人)博客园博客，原文链接：http://www.cnblogs.com/phinecos/archive/2008/11/07/1328887.html，如需转载请自行联系原作者