《基于MFC的OpenGL编程》Part 16 Reflection

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：

voidCCY457OpenGLView::SetupLighting()
{
//MaterialProperties
GLfloatmatSpecular[]={1.0f,0.0f,0.0f,0.7f};
GLfloatmatShininess[]={50.0f};
GLfloatmatAmbient[]={0.25f,0.25f,0.25f,0.7f};
GLfloatmatDiffuse[]={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);
//LightingParameters
//EnableLighting
glEnable(GL_LIGHTING);
//Specifyasingledirectionallight
GLfloatambient1[]={0.5f,0.5f,0.5f};
GLfloatdiffuse1[]={0.5f,0.5f,0.5f};
GLfloatspecular1[]={1.0f,0.0f,0.0f};
GLfloatposition1[]={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);
//Specifyasinglepositionalspotlight
GLfloatambient2[]={1.0f,1.0f,0.0f};
GLfloatdiffuse2[]={1.0f,0.0f,0.0f};
GLfloatposition2[]={1.0f,0.0f,5.0f,1.0};
GLfloatdirection2[]={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);
}

2,绘制函数修改如下：

voidCCY457OpenGLView::RenderScene()
{//绘制函数
glTranslatef(0.0f,0.0f,-8.0f);
//Savematrixstateanddotherotation
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();
//Drawbottomoffloor
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);
}
voidCCY457OpenGLView::DrawCube()
{
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D,m_Texture[0]);
//FrontFace
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();
//BackFace
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]);
//LeftFace
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();
//RightFace
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]);
//TopFace
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();
//BottonFace
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);
}

《基于MFC的OpenGL编程》Part 16 Reflection

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