Raycast

for(int worldX = 0; worldX<screenWidth/scale; worldX+=1) {
    for(int worldY = 0; worldY<screenHeight/scale; worldY+=1) {
        xS = Math.sin((((float) (worldX-screenWidth/scale/2)/(screenWidth/scale))*75+xRot)/180*Math.PI)*3 *  Math.cos((((float) (worldY-screenHeight/scale/2)/(screenHeight/scale))*45+yRot)/180*Math.PI)*3;
        yS = Math.sin((((float) (worldY-screenHeight/scale/2)/(screenHeight/scale))*45+yRot)/180*Math.PI)*3 *  Math.cos((((float) (worldX-screenWidth/scale/2)/(screenWidth/scale))*75+xRot)/180*Math.PI)*3;
        zS = Math.cos((((float) (worldX-screenWidth/scale/2)/(screenWidth/scale))*75+xRot)/180*Math.PI)*3;
        for(float ray=0; ray<=renderDistance; ray+=depthPercision+ray/100) {
            x = (Math.abs((camX+xS*ray)) % worldWidth);
            y = camY+yS*ray;
            z = (Math.abs((camZ+zS*ray)) % worldLength);
            if(world[(int) x][(int) y][(int) z] != null) {
                //I just hit a block...
            }
        }
    }
}