Here is a screenshot of my terrain engine.
As you can see, the lighting isnt very good. The normals are calculated per vertex. When you move the spotlight around, the terrain, instead of smoothly changing, goes very blocky. It looks light each square can only be lit up, or not lit up. It dosnt make it look very good.
Here is the code for my terrain:
void CIrisTerrain::CalculateNormalMap()
{
int X, Y;
int x,y,z;
CVector3 normal,v1,v2,v3,v4;
CVector3 pos[3];
CVector3 *PolyMap = new CVector3[1023*1023];
if(PolyMap==NULL){
IrisLogger.Write("Something planked up with the memory");
return;
}
//Find values for polymap
for(X=0;X<1023;X++)
{
for(Y=0;Y<1023;Y++)
{
//Vertex [0]
x=X;
z=Y;
y=Height(X,Y);
pos[0].x=x;
pos[0].y=y;
pos[0].z=z;
//Vertex [1]
x=X;
z=Y+1;
y=Height(X,Y+1);
pos[2].x=x;
pos[2].y=y;
pos[2].z=z;
//Vertex [2]
x=X+1;
z=Y;
y=Height(X+1,Y);
pos[1].x=x;
pos[1].y=y;
pos[1].z=z;
PolyMap[X+(Y*1023)] = Normal(pos);
}
}
//Find values for NormalMap based on polyMap
for(X=1;X<1023;X++)
{
for(Y=1;Y<1023;Y++)
{
v1 = PolyMap[(X-1)+((Y-1)*1023)];
v2 = PolyMap[(X)+((Y-1)*1023)];
v3 = PolyMap[X+(Y*1023)];
v4 = PolyMap[(X-1)+((Y)*1023)];
normal = v1+v2+v3+v4;
normal = Normalize(normal);
NormalMap[X+(Y*1023)] = normal;
}
}
delete[] PolyMap;
}
void CIrisTerrain::Draw(int scale, int step, bool poly)
{
int X, Y;
int x,y,z;
float col;
CVector3 normal;
glActiveTextureARB(GL_TEXTURE0_ARB);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D,TexID[0]);
glActiveTextureARB(GL_TEXTURE1_ARB);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D,TexID[2]);
if(poly==true)
{
glBegin(GL_QUADS);
}else{
glBegin(GL_LINES);
}
//loop
for(X=0;X<(1024-step);X+=step)
{
for(Y=0;Y<(1024-step);Y+=step)
{
//Vertex 1
x = X;
y = Height(X, Y)/scale;
z = Y;
col = 0.5+Color(y);
glColor3f(col,col,col);
normal.x = NormalMap[X+(Y*1023)].x;
normal.y = NormalMap[X+(Y*1023)].y;
normal.z = NormalMap[X+(Y*1023)].z;
glNormal3f(normal.x,normal.y,normal.z);
glMultiTexCoord2fARB(GL_TEXTURE0_ARB,0,0);glMultiTexCoord2fARB(GL_TEXTURE1_ARB,0,0);
glVertex3i(x, y, z);
//Vertex 2
x = X;
y = Height(X, Y + step)/scale;
z = Y + step ;
col = 0.5+Color(y);
glColor3f(col,col,col);
normal.x = NormalMap[X+((Y+step)*1023)].x;
normal.y = NormalMap[X+((Y+step)*1023)].y;
normal.z = NormalMap[X+((Y+step)*1023)].z;
glNormal3f(normal.x,normal.y,normal.z);
glMultiTexCoord2fARB(GL_TEXTURE0_ARB,0,1);glMultiTexCoord2fARB(GL_TEXTURE1_ARB,0,1);
glVertex3i(x,y,z);
//Vertex 3
x = X + step;
y = Height(X+step, Y + step)/scale;
z = Y + step;
col = 0.5+Color(y);
normal.x = NormalMap[(X+step)+((Y+step)*1023)].x;
normal.y = NormalMap[(X+step)+((Y+step)*1023)].y;
normal.z = NormalMap[(X+step)+((Y+step)*1023)].z;
glNormal3f(normal.x,normal.y,normal.z);
glColor3f(col,col,col);
glMultiTexCoord2fARB(GL_TEXTURE0_ARB,1,1);glMultiTexCoord2fARB(GL_TEXTURE1_ARB,1,1);
glVertex3i(x,y,z);
//Vertex 4
x = X + step;
y = Height(X+step, Y)/scale;
z = Y;
col = 0.5+Color(y);
glColor3f(col,col,col);
normal.x = NormalMap[(X+step)+((Y)*1023)].x;
normal.y = NormalMap[(X+step)+((Y)*1023)].y;
normal.z = NormalMap[(X+step)+((Y)*1023)].z;
glNormal3f(normal.x,normal.y,normal.z);
glMultiTexCoord2fARB(GL_TEXTURE0_ARB,1,0);glMultiTexCoord2fARB(GL_TEXTURE1_ARB,1,0);
glVertex3i(x,y,z);
glColor3f(1,1,1);
}
}
glEnd();
glActiveTextureARB(GL_TEXTURE1_ARB);
glDisable(GL_TEXTURE_2D);
glActiveTextureARB(GL_TEXTURE0_ARB);
}
If anyone could just have a quick look through. Or just sugest something. Thx
------------ "Here lies a toppled God,His fall was not a small one,We but built his pedastle,A narrow, and a tall one" Frank Herbert (Dune:Messiah)
