Discussion :

[Laustralien49]

Hello,

Je vous soumet mon problème en espérant recevoir un peu d'aide pour mon premier post .
Voila, le but de mon bout de code est relativement simple, affiché une lumière sur un sprite 2D. Mais je ne suis pas convaincu par mon rendu (cf screen) car comme vous pourrez le voir le dégradé se fait par "triangle".
Si quelqu'un a une idée je suis preneur.

Merci d'avance

Voici mon bout de code:

Code :

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void	VGL_TesslatedSprite::Draw(){
 
	if ((flags & VGL_VISIBLE)==0){
		return;
	}
 
	Vector2 elm_size = Vector2(size.x/(float)tes_x,size.y/(float)tes_y);
	Vector2 elm_pos,variable_elm_size,sprite_center;
	Vector2 base_pos = (pos + size - Vector2(0,elm_size.y));
	SubSprite sub;
	VGL_Color CurrentColor;
 
	sprite_center = pos + Vector2(size.x*0.5f,size.y*0.5f);
 
	float tex_size_x = 1.0f / (float)tes_x;
	float tex_size_y = 1.0f / (float)tes_y;
	float cx,cy;
	int k,l;
 
	BIND(texid); 
 
	for (int i=0;i<tes_x*tes_y;i++){
 
			cx = float(i%tes_x)/(float)tes_x;							
			cy = float(i/tes_y)/(float)tes_y;	
			k = i%tes_x;
			l = (int)::floor(i/(float)tes_y);
 
			elm_pos =  base_pos - Vector2((1-cx)*size.x,(cy)*size.y);
			variable_elm_size = elm_size;
 
			sub.t1.x  = cx             ;  sub.t1.y = 1.0f - cy;
			sub.t2.x  = cx+tex_size_x  ;  sub.t2.y = 1.0f - cy;
			sub.t3.x  = cx+tex_size_x  ;  sub.t3.y = 1.0f - (cy+tex_size_y);
			sub.t4.x  = cx             ;  sub.t4.y = 1.0f - (cy+tex_size_y);
 
 
			glBegin(GL_QUADS);
 
			float d = distance2d(Vector2(elm_pos.x ,elm_pos.y+variable_elm_size.y ),pLightSource->GetPos());
			float Alpha = 1 / (Kc + Kl*d + Kq*(d*d));
			Alpha = clamp<float>(Alpha,0,1);
			CDebug::GetSingleton()->Add("1- Kc = %f, Kl*d= %f, Kq*d²= %f, Alpha= %f, distance= %f",Kc, Kl*d, Kq*(d*d), Alpha, d);
			CurrentColor.Combine(pLightSource->Ambiante,pLightSource->Light, Alpha * pLightSource->GetIntensity());
 
			glColor4f(CurrentColor.r,CurrentColor.g, CurrentColor.b, CurrentColor.alpha);
			glTexCoord2f(sub.t1.x, sub.t1.y);
			glVertex2f(elm_pos.x, elm_pos.y+variable_elm_size.y );	// Vertex Coord (Bottom Left)	
 
 
 
			d = distance2d(Vector2(elm_pos.x + variable_elm_size.x , elm_pos.y+elm_size.y),pLightSource->GetPos());
			Alpha = 1 / (Kc + Kl*d + Kq*(d*d));
			Alpha = clamp<float>(Alpha,0,1);
			CDebug::GetSingleton()->Add("2- Kc = %f, Kl*d= %f, Kq*d²= %f, Alpha= %f, distance= %f",Kc, Kl*d, Kq*(d*d), Alpha, d);
			CurrentColor.Combine(pLightSource->Ambiante,pLightSource->Light, Alpha * pLightSource->GetIntensity());
 
			glColor4f(CurrentColor.r,CurrentColor.g, CurrentColor.b, CurrentColor.alpha);
			glTexCoord2f(sub.t2.x, sub.t2.y);
			glVertex2f(elm_pos.x + variable_elm_size.x, elm_pos.y+elm_size.y );	    // Vertex Coord (Bottom Right)	
 
 
 
			d = distance2d(Vector2(elm_pos.x + variable_elm_size.x ,elm_pos.y),pLightSource->GetPos());
			Alpha = 1 / (Kc + Kl*d + Kq*(d*d));
			Alpha = clamp<float>(Alpha,0,1);
			CDebug::GetSingleton()->Add("3- Kc = %f, Kl*d= %f, Kq*d²= %f, Alpha= %f, distance= %f",Kc, Kl*d, Kq*(d*d), Alpha, d);
			CurrentColor.Combine(pLightSource->Ambiante,pLightSource->Light, Alpha * pLightSource->GetIntensity());
 
			glColor4f(CurrentColor.r,CurrentColor.g, CurrentColor.b, CurrentColor.alpha);
			glTexCoord2f(sub.t3.x, sub.t3.y);
			glVertex2f(elm_pos.x + variable_elm_size.x, elm_pos.y );		    // Vertex Coord (Top Right)	
 
 
 
			d = distance2d(Vector2(elm_pos.x ,elm_pos.y),pLightSource->GetPos());
			Alpha = 1 / (Kc + Kl*d + Kq*(d*d));
			Alpha = clamp<float>(Alpha,0,1);
			CDebug::GetSingleton()->Add("4- Kc = %f, Kl*d= %f, Kq*d²= %f, Alpha= %f, distance= %f",Kc, Kl*d, Kq*(d*d), Alpha, d);
			CurrentColor.Combine(pLightSource->Ambiante,pLightSource->Light, Alpha * pLightSource->GetIntensity());
 
			glColor4f(CurrentColor.r,CurrentColor.g, CurrentColor.b, CurrentColor.alpha);
			glTexCoord2f(sub.t4.x, sub.t4.y );
			glVertex2f(elm_pos.x, elm_pos.y );	
 
			glEnd();
 
			/*glBegin(GL_LINES);
			glColor3ub(255,255,255);
 
			glVertex2f(elm_pos.x, elm_pos.y+variable_elm_size.y );		// Vertex Coord (Bottom Left)	
			glVertex2f(elm_pos.x + variable_elm_size.x, elm_pos.y+elm_size.y );	    // Vertex Coord (Bottom Right)
 
			glVertex2f(elm_pos.x, elm_pos.y );		    // Vertex Coord (Top Right)	
			glVertex2f(elm_pos.x, elm_pos.y + elm_pos.y+elm_size.y);	
			glEnd();*/
 
			glPointSize( 5 );
			glBegin(GL_POINTS);
			glVertex2f(pLightSource->GetPos().x, pLightSource->GetPos().y );		// Vertex Coord (Bottom Left)	
			glEnd();
	}
 
}