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Hi, Why both room and cube are colored, if I only did glcolor3f before cube?
  
// MainWnd.cpp: implementation of the CMainWnd class.

//

//////////////////////////////////////////////////////////////////////


#include "StdAfx.h"
#include "MainWnd.h"
#include "Numen.h"

#include <gl\glut.h>


//////////////////////////////////////////////////////////////////////

// Global Variables

//////////////////////////////////////////////////////////////////////


////// Light

float ambientLight[] = { 0.5f, 0.5f, 0.5f, 1.0f };
float diffuseLight[] = { 0.25f, 0.25f, 0.25f, 1.0f };	
float lightPosition[] = {-5.0,-5.0, 5.0, 0.0};	

////// Materials

float matDiff[] = { 1.0f, 1.0f, 1.0f, 1.0f};


//////////////////////////////////////////////////////////////////////

// Construction/Destruction

//////////////////////////////////////////////////////////////////////

CMainWnd::CMainWnd():
	m_hWnd(NULL),
	angle(0.0f),
	m_hRC(NULL)
{
}

CMainWnd::~CMainWnd()
{
}


void CMainWnd::drawCube(float xPos, float yPos, float zPos)
{
	glPushMatrix();	
		glColor3f(1.0, 0.0, 0.0);
		glTranslatef(xPos, yPos, zPos);
		glRotatef(angle, 1.0, 0.0, 0.0);
		glRotatef(angle, 0.0, 1.0, 0.0);
		glRotatef(angle, 0.0, 0.0, 1.0);
		glutSolidCube(4);
	glPopMatrix();
}


//

// GLCube()

// Renders a cube.

//

void CMainWnd::drawRoom(float xPos, float yPos, float zPos)
{
	glBegin(GL_QUADS);
		glNormal3f(0.0, 1.0, 0.0);
		glVertex3f(-20.0, -5.0, 10.0);
		glVertex3f( 20.0, -5.0, 10.0);
		glVertex3f( 20.0, -5.0,-20.0);
		glVertex3f(-20.0, -5.0,-20.0);
	glEnd();

	glBegin(GL_QUADS);
		glNormal3f(0.0, 0.0, 1.0);
		glVertex3f(-20.0,27.0, -20.0);
		glVertex3f( 20.0,27.0, -20.0);
		glVertex3f( 20.0,-5.0, -20.0);
		glVertex3f(-20.0,-5.0, -20.0);
	glEnd();

	glBegin(GL_QUADS);
		glNormal3f(-1.0, 0.0, 0.0);
		glVertex3f(20.0, -5.0, -20.0);
		glVertex3f(20.0, -5.0,  10.0);
		glVertex3f(20.0, 27.0,  10.0);
		glVertex3f(20.0, 27.0, -20.0);
	glEnd();

	drawCube(3.0, 5.0, 8.0);
}


//

// InitScene()

// Called when the OpenGL RC has been created. Sets the initial state for

// the OpenGL scene.

//

void CMainWnd::InitScene()
{
	glClearColor(0.0, 0.0, 0.0, 0.0);

    glEnable(GL_DEPTH_TEST);

	glEnable(GL_LIGHTING);

	glMaterialfv(GL_FRONT, GL_DIFFUSE, matDiff);

    glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuseLight);
	glLightfv(GL_LIGHT0, GL_AMBIENT, ambientLight);
	glLightfv(GL_LIGHT0, GL_POSITION, lightPosition); 

	glEnable(GL_LIGHT0);
    glEnable(GL_COLOR_MATERIAL);
    glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);
}

//

// KillScene()

// Called when the OpenGL RC is about to be destroyed. 

//

void CMainWnd::KillScene()
{
	// TODO: Use KillScene to free resources.

}

//

// DrawScene()

// Called each time the OpenGL scene has to be drawn.

//

void CMainWnd::DrawScene()
{
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear buffers

  glLoadIdentity(); // Load identity matrix


  gluLookAt(0.0, 5.0, 25.0, 17.0, 5.0, -20.0, 0.0, 1.0, 0.0);
  
  drawRoom(0.0, 0.0, -5.0);

  glFlush();

  SwapBuffers(hDC);
}

void CMainWnd::Tick(BOOL &bRedrawScene)
{
	angle += 1;			// Add some rotation to the cube

}
  
Thanks

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