How to stop rendering invisible faces
- by TheMorfeus
I am making a voxel-based game, and for needs of it, i am creating a block rendering engine.
Point is, that i need to generate lots of cubes. Every time i render more than 16x16x16 chunk of theese blocks, my FPS is dropped down hardly, because it renders all 6 faces of all of theese cubes. THat's 24 576 quads, and i dont want that.
So, my question is, How to stop rendering vertices(or quads) that are not visible, and therefore increase performance of my game?
Here is class for rendering of a block:
public void renderBlock(int posx, int posy, int posz) {
try{
//t.bind();
glEnable(GL_CULL_FACE);
glCullFace(GL_BACK);// or even GL_FRONT_AND_BACK */);
glPushMatrix();
GL11.glTranslatef((2*posx+0.5f),(2*posy+0.5f),(2*posz+0.5f)); // Move Right 1.5 Units And Into The Screen 6.0
GL11.glRotatef(rquad,1.0f,1.0f,1.0f);
glBegin(GL_QUADS); // Draw A Quad
GL11.glColor3f(0.5f, 0.4f, 0.4f); // Set The Color To Green
GL11.glTexCoord2f(0,0);
GL11.glVertex3f( 1f, 1f,-1f); // Top Right Of The Quad (Top)
GL11.glTexCoord2f(1,0);
GL11.glVertex3f(-1f, 1f,-1f); // Top Left Of The Quad (Top)
GL11.glTexCoord2f(1,1);
GL11.glVertex3f(-1f, 1f, 1f); // Bottom Left Of The Quad (Top)
GL11.glTexCoord2f(0,1);
GL11.glVertex3f( 1f, 1f, 1f); // Bottom Right Of The Quad (Top)
//GL11.glColor3f(1.2f,0.5f,0.9f); // Set The Color To Orange
GL11.glTexCoord2f(0,0);
GL11.glVertex3f( 1f,-1f, 1f); // Top Right Of The Quad (Bottom)
GL11.glTexCoord2f(0,1);
GL11.glVertex3f(-1f,-1f, 1f); // Top Left Of The Quad (Bottom)
GL11.glTexCoord2f(1,1);
GL11.glVertex3f(-1f,-1f,-1f); // Bottom Left Of The Quad (Bottom)
GL11.glTexCoord2f(1,0);
GL11.glVertex3f( 1f,-1f,-1f); // Bottom Right Of The Quad (Bottom)
//GL11.glColor3f(1.0f,0.0f,0.0f); // Set The Color To Red
GL11.glTexCoord2f(0,0);
GL11.glVertex3f( 1f, 1f, 1f); // Top Right Of The Quad (Front)
GL11.glTexCoord2f(1,0);
GL11.glVertex3f(-1f, 1f, 1f); // Top Left Of The Quad (Front)
GL11.glTexCoord2f(1,1);
GL11.glVertex3f(-1f,-1f, 1f); // Bottom Left Of The Quad (Front)
GL11.glTexCoord2f(0,1);
GL11.glVertex3f( 1f,-1f, 1f); // Bottom Right Of The Quad (Front)
//GL11.glColor3f(1f,0.5f,0.0f); // Set The Color To Yellow
GL11.glTexCoord2f(0,0);
GL11.glVertex3f( 1f,-1f,-1f); // Bottom Left Of The Quad (Back)
GL11.glTexCoord2f(1,0);
GL11.glVertex3f(-1f,-1f,-1f); // Bottom Right Of The Quad (Back)
GL11.glTexCoord2f(1,1);
GL11.glVertex3f(-1f, 1f,-1f); // Top Right Of The Quad (Back)
GL11.glTexCoord2f(0,1);
GL11.glVertex3f( 1f, 1f,-1f); // Top Left Of The Quad (Back)
//GL11.glColor3f(0.0f,0.0f,0.3f); // Set The Color To Blue
GL11.glTexCoord2f(0,1);
GL11.glVertex3f(-1f, 1f, 1f); // Top Right Of The Quad (Left)
GL11.glTexCoord2f(1,1);
GL11.glVertex3f(-1f, 1f,-1f); // Top Left Of The Quad (Left)
GL11.glTexCoord2f(1,0);
GL11.glVertex3f(-1f,-1f,-1f); // Bottom Left Of The Quad (Left)
GL11.glTexCoord2f(0,0);
GL11.glVertex3f(-1f,-1f, 1f); // Bottom Right Of The Quad (Left)
//GL11.glColor3f(0.5f,0.0f,0.5f); // Set The Color To Violet
GL11.glTexCoord2f(0,0);
GL11.glVertex3f( 1f, 1f,-1f); // Top Right Of The Quad (Right)
GL11.glTexCoord2f(1,0);
GL11.glVertex3f( 1f, 1f, 1f); // Top Left Of The Quad (Right)
GL11.glTexCoord2f(1,1);
GL11.glVertex3f( 1f,-1f, 1f); // Bottom Left Of The Quad (Right)
GL11.glTexCoord2f(0,1);
GL11.glVertex3f( 1f,-1f,-1f); // Bottom Right Of The Quad (Right)
//rquad+=0.0001f;
glEnd();
glPopMatrix();
}catch(NullPointerException t){t.printStackTrace(); System.out.println("rendering block failed");}
}
Here is code that renders them:
private void render() {
GL11.glClear(GL11.GL_COLOR_BUFFER_BIT|GL11.GL_DEPTH_BUFFER_BIT);
for(int y=0; y<32; y++){
for(int x=0; x<16; x++){
for(int z=0; z<16; z++) {
b.renderBlock(x, y, z);
}
}
}
}
