不错的前段代码分享

12345 html,body{ margin:0px; width:100%; height:100%; overflow:hidden; background:#000; } #canvas{ position:absolute; width:100%; height:100%; } function project3D(x,y,z,vars){ var p,d; x-=vars.camX; y-=vars.camY-8; z-=vars.camZ; p=Math.atan2(x,z); d=Math.sqrt(x*x+z*z); x=Math.sin(p-vars.yaw)*d; z=Math.cos(p-vars.yaw)*d; p=Math.atan2(y,z); d=Math.sqrt(y*y+z*z); y=Math.sin(p-vars.pitch)*d; z=Math.cos(p-vars.pitch)*d; var rx1=-1000; var ry1=1; var rx2=1000; var ry2=1; var rx3=0; var ry3=0; var rx4=x; var ry4=z; var uc=(ry4-ry3)*(rx2-rx1)-(rx4-rx3)*(ry2-ry1); var ua=((rx4-rx3)*(ry1-ry3)-(ry4-ry3)*(rx1-rx3))/uc; var ub=((rx2-rx1)*(ry1-ry3)-(ry2-ry1)*(rx1-rx3))/uc; if(!z)z=0.000000001; if(ua>0&&ua0&&ub return { x:vars.cx+(rx1+ua*(rx2-rx1))*vars.scale, y:vars.cy+y/z*vars.scale, d:(x*x+y*y+z*z) }; }else{ return { d:-1 }; } } function elevation(x,y,z){ var dist = Math.sqrt(x*x+y*y+z*z); if(dist && z/dist>=-1 && z/dist return 0.00000001; } function rgb(col){ col += 0.000001; var r = parseInt((0.5+Math.sin(col)*0.5)*16); var g = parseInt((0.5+Math.cos(col)*0.5)*16); var b = parseInt((0.5-Math.sin(col)*0.5)*16); return