unity3d 画任意线（GL方式高级应用） - 纳金网

#pragma strict
private var origPoints : Vector2[];
var numberOfPoints = 31;
var lineColor = Color.white;
var lineWidth = 3;
var drawLines = true;
var i = 0;
private var lineMaterial : Material;
private var linePoints : Vector2[];
private var cam : Camera;
function Awake () {
lineMaterial = new Material( "Shader \"Lines/Colored Blended\" {" +
"SubShader { Pass {" +
" BindChannels { Bind \"Color\",color }" +
" Blend SrcAlpha OneMinusSrcAlpha" +
" ZWrite Off Cull Off Fog { Mode Off }" +
"} } }");
lineMaterial.hideFlags = HideFlags.HideAndDontSave;
lineMaterial.shader.hideFlags = HideFlags.HideAndDontSave;
cam = camera;
}
function Start () {
linePoints = new Vector2[numberOfPoints];
origPoints = new Vector2[numberOfPoints];
// Plot points on a circle
var radians : float = 360.0/(numberOfPoints-1)*Mathf.Deg2Rad;
var p = 0.0;
for (i = 0; i < numberOfPoints; i++) {
linePoints[i] = Vector2(.5 + .25*Mathf.Cos(p), .5 + .25*Mathf.Sin(p));
origPoints[i] = linePoints[i];
p += radians;
}
}
function Update () {
for (i = 0; i < linePoints.Length; i++) {
if (i%2 == 0) {var m = .4; var t = 1.0;}
else {m = .5; t = .5;}
linePoints[i] = (origPoints[i]-Vector2(.5, .5))*(Mathf.Sin(Time.time*t)+Mathf.PI*m)+Vector2(.5, .5);
}
}
function OnPostRender () {
if (!drawLines || !linePoints || linePoints.Length < 2) {return;}
var nearClip = cam.nearClipPlane + .00001; // Add a bit, else there's flickering when the camera moves
var end = linePoints.Length - 1;
var thisWidth = 1.0/Screen.width * lineWidth * .5;
lineMaterial.SetPass(0);
GL.Color(lineColor);
if (lineWidth == 1) {
GL.Begin(GL.LINES);
for (i = 0; i < end; i++) {
GL.Vertex(cam.ViewportToWorldPoint(Vector3(linePoints[i].x, linePoints[i].y, nearClip)));
GL.Vertex(cam.ViewportToWorldPoint(Vector3(linePoints[i+1].x, linePoints[i+1].y, nearClip)));
}
}
else {
GL.Begin(GL.QUADS);
for (i = 0; i < end; i++) {
var perpendicular = (Vector3(linePoints[i+1].y, linePoints[i].x, nearClip) -
Vector3(linePoints[i].y, linePoints[i+1].x, nearClip)).normalized * thisWidth;
var v1 = Vector3(linePoints[i].x, linePoints[i].y, nearClip);
var v2 = Vector3(linePoints[i+1].x, linePoints[i+1].y, nearClip);
GL.Vertex(cam.ViewportToWorldPoint(v1 - perpendicular));
GL.Vertex(cam.ViewportToWorldPoint(v1 + perpendicular));
GL.Vertex(cam.ViewportToWorldPoint(v2 + perpendicular));
GL.Vertex(cam.ViewportToWorldPoint(v2 - perpendicular));
}
}
GL.End();
}
function OnApplicationQuit () {
DestroyImmediate(lineMaterial);
}

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