Discussion :

[grmi91]

Bonjour,

Je viens de faire l'ombrage plat sur un cube et je souhaiterais faire un ombrage de Gouraud en openGL.

code de l'ombrage plat :

Code :

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#define ESCAPE 27

GLfloat light_position[] = { 1.0F,0.0F,1.0F,0.0F };
GLfloat lightambiant[] = { 1.0f,1.0f,1.0f,0.0};
int window; 

void InitGL(int Width, int Height)	        
{
	glClearColor(0.0f, 0.0f, 0.0f, 0.0f);		
	glClearDepth(1.0);
	glDepthFunc(GL_LESS);	
	glEnable(GL_DEPTH_TEST);	
	glEnable(GL_LIGHTING);
	glEnable(GL_LIGHT0); 	
	glLightfv(GL_LIGHT0,GL_POSITION,light_position);	
	glLightfv(GL_LIGHT0,GL_AMBIENT,lightambiant);


	/* model d'ombrage */
	glShadeModel(GL_SMOOTH);		//GL_FLAT = ombrage plat; GL_SMOOTH = ombrage de Gouraud (degradé)
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();				
	gluPerspective(45.0f,(GLfloat)Width/(GLfloat)Height,0.1f,100.0f);	
	glMatrixMode(GL_MODELVIEW);
}


void ReSizeGLScene(int Width, int Height)
{
	// ...
}

void DrawGLScene()
{  	
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);		
  	glLoadIdentity();		
	glLoadIdentity();
	gluLookAt(8.0,6.0,4.0,0.0,0.0,0.0,0.0,1.0,0.0); 


             /*************************
             * Cube avec ombrage plat *
             *************************/
             //dessin cube en donner les 4 sommets et la normale des 6 faces
  	     glBegin (GL_QUADS);
		// face 1
		glNormal3f (0.0f,0.0f,1.0f);      
		glVertex3i(1,1,1);                  
		glVertex3i(1,-1,1);                  
		glVertex3i(-1,-1,1);                 
		glVertex3i(-1,1,1);                  
                //face2
		glNormal3f (0.0f,0.0f,-1.0f);     
		glVertex3i(1,1,-1);                 
		glVertex3i(1,-1,-1);                 
		glVertex3i(-1,-1,-1);              
		glVertex3i(-1,1,-1);                  
	             // face3
	glNormal3f (1.0f,0.0f,0.0f);      
		glVertex3i(1,1,1);                   
		glVertex3i(1,-1,1);                  
		glVertex3i(1,-1,-1);                  
		glVertex3i(1,1,-1);                  
	             // face4
		glNormal3f (-1.0f,0.0f,0.0f);     
		glVertex3i(-1,1,1);                
		glVertex3i(-1,-1,1);                
		glVertex3i(-1,-1,-1);               
		glVertex3i(-1,1,-1);                  
	   // face5
		glNormal3f (0.0f,1.0f,0.0f);     
		glVertex3i(-1,1,-1);                
		glVertex3i(-1,1,1);                  
		glVertex3i(1,1,1);                   
		glVertex3i(1,1,-1);                  
	   // face6
		glNormal3f (0.0f,-1.0f,0.0f);     
	    	glVertex3i(-1,-1,1);                 
		glVertex3i(1,-1,1);                  
		glVertex3i(1,-1,-1);                 
	glEnd ();
	glutSwapBuffers();
}

void keyPressed(unsigned char key, int x, int y) 
{
	// ...
}

int main(int argc, char **argv) 
{
	// ...
}

Donc si quelqu'un pouvait m'aider pour l'ombrage de Gouraud ce serait sympa.
Merci

[ram-0000]

Peut être que tu auras plus de réponses sur le forum OpenGL ici : http://www.developpez.net/forums/forumdisplay.php?f=53