unity3d 画任意线（GL方式高级应用）

王者再临

Unity3d 画任意线（GL方式高级应用）

1. 
   
2. #pragma strict
   
3. 
   
4. private var origPoints : Vector2[];
   
5. 
   
6. var numberOfPoints = 31;
   
7. 
   
8. var lineColor = Color.white;
   
9. 
   
10. var lineWidth = 3;
    
11. 
    
12. var drawLines = true;
    
13. 
    
14. var i = 0;
    
15. 
    
16. private var lineMaterial : Material;
    
17. 
    
18. private var linePoints : Vector2[];
    
19. 
    
20. private var cam : Camera;
    
21. 
    
22.   
    
23. 
    
24. function Awake () {
    
25. 
    
26. lineMaterial = new Material( "Shader \"Lines/Colored Blended\" {" +
    
27. 
    
28. "SubShader { Pass {" +
    
29. 
    
30. "   BindChannels { Bind \"Color\",color }" +
    
31. 
    
32. "   Blend SrcAlpha OneMinusSrcAlpha" +
    
33. 
    
34. "   ZWrite Off Cull Off Fog { Mode Off }" +
    
35. 
    
36. "} } }");
    
37. 
    
38. lineMaterial.hideFlags = HideFlags.HideAndDontSave;
    
39. 
    
40. lineMaterial.shader.hideFlags = HideFlags.HideAndDontSave;
    
41. 
    
42. cam = camera;
    
43. 
    
44. }
    
45. 
    
46.   
    
47. 
    
48. function Start () {
    
49. 
    
50. linePoints = new Vector2[numberOfPoints];
    
51. 
    
52. origPoints = new Vector2[numberOfPoints];
    
53. 
    
54.   
    
55. 
    
56. // Plot points on a circle
    
57. 
    
58. var radians : float = 360.0/(numberOfPoints-1)*Mathf.Deg2Rad;
    
59. 
    
60. var p = 0.0;
    
61. 
    
62. for (i = 0; i < numberOfPoints; i++) {
    
63. 
    
64. linePoints[i] = Vector2(.5 + .25*Mathf.Cos(p), .5 + .25*Mathf.Sin(p));
    
65. 
    
66. origPoints[i] = linePoints[i];
    
67. 
    
68. p += radians;
    
69. 
    
70. }
    
71. 
    
72. }
    
73. 
    
74.   
    
75. 
    
76. function Update () {
    
77. 
    
78. for (i = 0; i < linePoints.Length; i++) {
    
79. 
    
80. if (i%2 == 0) {var m = .4; var t = 1.0;}
    
81. 
    
82. else {m = .5; t = .5;}
    
83. 
    
84. linePoints[i] = (origPoints[i]-Vector2(.5, .5))*(Mathf.Sin(Time.time*t)+Mathf.PI*m)+Vector2(.5, .5);
    
85. 
    
86. }
    
87. 
    
88. }
    
89. 
    
90.   
    
91. 
    
92. function OnPostRender () {
    
93. 
    
94. if (!drawLines || !linePoints || linePoints.Length < 2) {return;}
    
95. 
    
96.   
    
97. 
    
98. var nearClip = cam.nearClipPlane + .00001; // Add a bit, else there's flickering when the camera moves
    
99. 
    
100. var end = linePoints.Length - 1;
     
101. 
     
102. var thisWidth = 1.0/Screen.width * lineWidth * .5;
     
103. 
     
104.   
     
105. 
     
106. lineMaterial.SetPass(0);
     
107. 
     
108. GL.Color(lineColor);
     
109. 
     
110.   
     
111. 
     
112. if (lineWidth == 1) {
     
113. 
     
114. GL.Begin(GL.LINES);
     
115. 
     
116. for (i = 0; i < end; i++) {
     
117. 
     
118. GL.Vertex(cam.ViewportToWorldPoint(Vector3(linePoints[i].x, linePoints[i].y, nearClip)));
     
119. 
     
120. GL.Vertex(cam.ViewportToWorldPoint(Vector3(linePoints[i+1].x, linePoints[i+1].y, nearClip)));
     
121. 
     
122. }
     
123. 
     
124. }
     
125. 
     
126. else {
     
127. 
     
128. GL.Begin(GL.QUADS);
     
129. 
     
130. for (i = 0; i < end; i++) {
     
131. 
     
132. var perpendicular = (Vector3(linePoints[i+1].y, linePoints[i].x, nearClip) -
     
133. 
     
134. Vector3(linePoints[i].y, linePoints[i+1].x, nearClip)).normalized * thisWidth;
     
135. 
     
136. var v1 = Vector3(linePoints[i].x, linePoints[i].y, nearClip);
     
137. 
     
138. var v2 = Vector3(linePoints[i+1].x, linePoints[i+1].y, nearClip);
     
139. 
     
140. GL.Vertex(cam.ViewportToWorldPoint(v1 - perpendicular));
     
141. 
     
142. GL.Vertex(cam.ViewportToWorldPoint(v1 + perpendicular));
     
143. 
     
144. GL.Vertex(cam.ViewportToWorldPoint(v2 + perpendicular));
     
145. 
     
146. GL.Vertex(cam.ViewportToWorldPoint(v2 - perpendicular));
     
147. 
     
148. }
     
149. 
     
150. }
     
151. 
     
152. GL.End();
     
153. 
     
154. }
     
155. 
     
156.   
     
157. 
     
158. function OnApplicationQuit () {
     
159. 
     
160. DestroyImmediate(lineMaterial);
     
161. 
     
162. }

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