model, shade, looksRealistic OpenGL

[sujan.dasmahapatra]

Dear Friends
I am successfully able to generate a 3D surface by revolving the profiles by 360 degree. Now my 3d model is in red color so the color is so shining I am not able to distinguish various parts in the model. For this I am trying to use some lighting but I am not successful. Can u help me someone what kind of lighting should I use so that my model looks realistics and I would be able to visualize various parts on the model . Check my snippet I am trying to use this kind of lighting but finding black shadows on the sides not able to visualize properly. Thanks a lot for any help.

void CRevolutionProjView::OnViewShade()
{
	// TODO: Add your command handler code here
		// TODO: Add your command handler code here

		CDC* pDC = GetDC();
		wglMakeCurrent(pDC->m_hDC, m_hrc);

	   glClearDepth(1.0f);
       glEnable(GL_DEPTH_TEST);
       glDepthFunc(GL_LEQUAL);
       glShadeModel(GL_SMOOTH);
       glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_FASTEST);
       // Enable light and setup 2 light sources (GL_LIGHT0 and GL_LIGHT1)
       glEnable(GL_LIGHTING);
       glEnable(GL_LIGHT0);
       glEnable(GL_LIGHT1);
  	   glColor3f(1.0f, 0.0f, 0.0f); 
	   // We're setting up twolight sources. One of them is located
       // on the left side ofthe model (x = -1.5f) and emits white light. The
       // second light sourceis located on the right side of the model (x = 1.5f)
       // emitting red light.
       // GL_LIGHT0: the whitelight emitting light source
       // Create lightcomponents for GL_LIGHT0
	   GLfloat emissionLight0[] = {0.2f, 0.0f, 0.0f, 1.0f};
	   GLfloat ambientLight0[] = { 0.2f, 0.2f, 0.2f, 1.0f };
	   GLfloat diffuseLight0[] = { 0.8f, 0.8f, 0.8, 1.0f };
	   GLfloat specularLight0[] = { 0.5f, 0.5f, 0.5f, 1.0f };
	   GLfloat position0[] = { -1.5f, 1.0f, -4.0f, 1.0f };
     
       // Assign createdcomponents to GL_LIGHT0
       glLightfv(GL_LIGHT0, GL_AMBIENT, ambientLight0);
       glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuseLight0);
       glLightfv(GL_LIGHT0, GL_SPECULAR, specularLight0);
       glLightfv(GL_LIGHT0, GL_EMISSION, emissionLight0);
       glLightfv(GL_LIGHT0, GL_POSITION, position0);
       // GL_LIGHT1: the redlight emitting light source
       // Create lightcomponents for GL_LIGHT1
       float ambientLight1[] = { 0.2f, 0.2f, 0.2f, 1.0f };
       float diffuseLight1[] = { 0.8f, 0.8f, 0.8f, 1.0f };
       float specularLight1[] = { 0.5f, 0.5f, 0.5f, 1.0f };
       float emissionLight1[] = { 0.2f, 0.0f, 0.0f, 1.0f };
	   float position1[]= { -1.5f, 1.0f, -4.0f, 1.0f  };       
       // Assign createdcomponents to GL_LIGHT1
       glLightfv(GL_LIGHT1, GL_AMBIENT, ambientLight1);
       glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuseLight1);
       glLightfv(GL_LIGHT1, GL_SPECULAR, specularLight1);
       glLightfv(GL_LIGHT1, GL_EMISSION, emissionLight1);
       glLightfv(GL_LIGHT1, GL_POSITION, position1);
       //---------------------------------
	   // enable color tracking
	   glEnable(GL_COLOR_MATERIAL);
	   // set material properties which will be assigned by glColor
	   glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);
	   // ...Somewhere in the main rendering loop of your program...
	   // Draw a polygon with material properties set by glColor
	   float specReflection[] = { 0.8f, 0.8f, 0.8f, 1.0f };
	   glMaterialfv(GL_FRONT, GL_SPECULAR, specReflection);
	   glMateriali(GL_FRONT, GL_SHININESS, 96);
	   glPolygonMode( GL_FRONT_AND_BACK, GL_FILL );
	   Invalidate();
	   wglMakeCurrent(NULL,NULL);
}

[JDeanD]

Use glMaterial (not glColor) to set your model's appearance and be sure that you're assigning surface normals. This will improve the look of your model a lot.

[JDeanD]

Ok, just saw that you are using glColorMaterial....

Are you using surface normals?

[sujan.dasmahapatra]

no i am not using surface normals. Can u give some hint how can use surface normals ? Thanks Sujan

[sujan.dasmahapatra]

Dear Friends
Now I am calculating normals and assigning a normal using glNormal3f() for each QUAD......When rendered it's coming fine but some quads near the edges are flickering. How can I resolve this. ? Please help me. Thanks Sujan

[sujan.dasmahapatra]

Dear Friends
I am able to implement shading but I dont know why when I am rotating zooming out near the edges its flickering. I am calculating normals for each QUQD like this ...V0,V1,V2,V3 are 4 vertiuces of the quad.

				vec1.x = v1[0] - v0[0];
				vec1.y = v1[1] - v0[1];
				vec1.z = v1[2] - v0[2];

				vec2.x = v3[0] - v0[0];
				vec2.y = v3[1] - v0[1];
				vec2.z = v3[2] - v0[2];

				normal1[0] = ((vec1.y*vec2.z)-(vec1.z * vec2.y));
				normal1[1] = ((vec1.z * vec2.x)-(vec1.x * vec2.z));
				normal1[2] = ((vec1.x * vec2.y)-(vec1.y * vec2.x));

				GLfloat len = sqrt((normal1[0]*normal1[0]) + (normal1[1]*normal1[1]) + (normal1[2]*normal1[2]));
				
				normal1[0] /= len;
				normal1[1] /= len;
				normal1[2] /= len;
				
				glBegin(GL_QUADS);      // draw a cube with 6 quads
				glNormal3f(normal1[0],normal1[1],normal1[2]);
				glVertex3fv(v0);    // front face
				glVertex3fv(v1);
				glVertex3fv(v2);
				glVertex3fv(v3);

[sujan.dasmahapatra]

my shade algorithms is like this ..

void CRevolutionProjView::OnViewShade()
{
	// TODO: Add your command handler code here
		// TODO: Add your command handler code here

	   CDC* pDC = GetDC();
	   wglMakeCurrent(pDC->m_hDC, m_hrc);
       glShadeModel(GL_SMOOTH);
       glEnable(GL_DEPTH_TEST);
	   glEnable(GL_LIGHTING);
       glEnable(GL_LIGHT0);
	   glEnable(GL_COLOR_MATERIAL);
	   GLfloat ambientLight0[] = { 0.3f, 0.3f, 0.3f, 1.0f };
	   GLfloat diffuseLight0[] = { 1.0f, 0.5f, 0.5f, 1.0f };
	   GLfloat specularLight0[] = { 0.0f, 0.0f, 1.0f, 1.0f };
	   GLfloat emissionLight0[] = {0.0f, 0.0f, 0.0f, 1.0f};
	   GLfloat position0[] = {1.0f,1.0f,1.0f,1.0f};
       glLightfv(GL_LIGHT0, GL_AMBIENT, ambientLight0);
       glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuseLight0);
       glLightfv(GL_LIGHT0, GL_SPECULAR, specularLight0);
       glLightfv(GL_LIGHT0, GL_EMISSION, emissionLight0);
	   glLightfv(GL_LIGHT0, GL_POSITION, position0);
	   glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);
	   glPolygonMode( GL_FRONT_AND_BACK, GL_FILL );
	   Invalidate();
	   wglMakeCurrent(NULL,NULL);
}

Its flickering near the edges... while zooming out its minimizing and clickering more.