webgl_geometry_nurbs.html 7.2 KB

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  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4. <title>three.js webgl - geometry - NURBS</title>
  5. <meta charset="utf-8">
  6. <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
  7. <link type="text/css" rel="stylesheet" href="main.css">
  8. <style>
  9. body {
  10. background-color: #f0f0f0;
  11. color: #444;
  12. }
  13. a {
  14. color: #08f;
  15. }
  16. </style>
  17. </head>
  18. <body>
  19. <div id="info">
  20. <a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - NURBS curve and surface example
  21. </div>
  22. <script src="../build/three.js"></script>
  23. <script src="js/curves/NURBSCurve.js"></script>
  24. <script src="js/curves/NURBSSurface.js"></script>
  25. <script src="js/curves/NURBSUtils.js"></script>
  26. <script src="js/libs/stats.min.js"></script>
  27. <script>
  28. var container, stats;
  29. var camera, scene, renderer;
  30. var group;
  31. var targetRotation = 0;
  32. var targetRotationOnMouseDown = 0;
  33. var mouseX = 0;
  34. var mouseXOnMouseDown = 0;
  35. var windowHalfX = window.innerWidth / 2;
  36. init();
  37. animate();
  38. function init() {
  39. container = document.createElement( 'div' );
  40. document.body.appendChild( container );
  41. camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 2000 );
  42. camera.position.set( 0, 150, 750 );
  43. scene = new THREE.Scene();
  44. scene.background = new THREE.Color( 0xf0f0f0 );
  45. scene.add( new THREE.AmbientLight( 0x808080 ) );
  46. var light = new THREE.DirectionalLight( 0xffffff, 1 );
  47. light.position.set( 1, 1, 1 );
  48. scene.add( light );
  49. group = new THREE.Group();
  50. group.position.y = 50;
  51. scene.add( group );
  52. // NURBS curve
  53. var nurbsControlPoints = [];
  54. var nurbsKnots = [];
  55. var nurbsDegree = 3;
  56. for ( var i = 0; i <= nurbsDegree; i ++ ) {
  57. nurbsKnots.push( 0 );
  58. }
  59. for ( var i = 0, j = 20; i < j; i ++ ) {
  60. nurbsControlPoints.push(
  61. new THREE.Vector4(
  62. Math.random() * 400 - 200,
  63. Math.random() * 400,
  64. Math.random() * 400 - 200,
  65. 1 // weight of control point: higher means stronger attraction
  66. )
  67. );
  68. var knot = ( i + 1 ) / ( j - nurbsDegree );
  69. nurbsKnots.push( THREE.Math.clamp( knot, 0, 1 ) );
  70. }
  71. var nurbsCurve = new THREE.NURBSCurve( nurbsDegree, nurbsKnots, nurbsControlPoints );
  72. var nurbsGeometry = new THREE.BufferGeometry();
  73. nurbsGeometry.setFromPoints( nurbsCurve.getPoints( 200 ) );
  74. var nurbsMaterial = new THREE.LineBasicMaterial( { color: 0x333333 } );
  75. var nurbsLine = new THREE.Line( nurbsGeometry, nurbsMaterial );
  76. nurbsLine.position.set( 200, - 100, 0 );
  77. group.add( nurbsLine );
  78. var nurbsControlPointsGeometry = new THREE.BufferGeometry();
  79. nurbsControlPointsGeometry.setFromPoints( nurbsCurve.controlPoints );
  80. var nurbsControlPointsMaterial = new THREE.LineBasicMaterial( { color: 0x333333, opacity: 0.25, transparent: true } );
  81. var nurbsControlPointsLine = new THREE.Line( nurbsControlPointsGeometry, nurbsControlPointsMaterial );
  82. nurbsControlPointsLine.position.copy( nurbsLine.position );
  83. group.add( nurbsControlPointsLine );
  84. // NURBS surface
  85. var nsControlPoints = [
  86. [
  87. new THREE.Vector4( - 200, - 200, 100, 1 ),
  88. new THREE.Vector4( - 200, - 100, - 200, 1 ),
  89. new THREE.Vector4( - 200, 100, 250, 1 ),
  90. new THREE.Vector4( - 200, 200, - 100, 1 )
  91. ],
  92. [
  93. new THREE.Vector4( 0, - 200, 0, 1 ),
  94. new THREE.Vector4( 0, - 100, - 100, 5 ),
  95. new THREE.Vector4( 0, 100, 150, 5 ),
  96. new THREE.Vector4( 0, 200, 0, 1 )
  97. ],
  98. [
  99. new THREE.Vector4( 200, - 200, - 100, 1 ),
  100. new THREE.Vector4( 200, - 100, 200, 1 ),
  101. new THREE.Vector4( 200, 100, - 250, 1 ),
  102. new THREE.Vector4( 200, 200, 100, 1 )
  103. ]
  104. ];
  105. var degree1 = 2;
  106. var degree2 = 3;
  107. var knots1 = [ 0, 0, 0, 1, 1, 1 ];
  108. var knots2 = [ 0, 0, 0, 0, 1, 1, 1, 1 ];
  109. var nurbsSurface = new THREE.NURBSSurface( degree1, degree2, knots1, knots2, nsControlPoints );
  110. var map = new THREE.TextureLoader().load( 'textures/UV_Grid_Sm.jpg' );
  111. map.wrapS = map.wrapT = THREE.RepeatWrapping;
  112. map.anisotropy = 16;
  113. function getSurfacePoint( u, v, target ) {
  114. return nurbsSurface.getPoint( u, v, target );
  115. }
  116. var geometry = new THREE.ParametricBufferGeometry( getSurfacePoint, 20, 20 );
  117. var material = new THREE.MeshLambertMaterial( { map: map, side: THREE.DoubleSide } );
  118. var object = new THREE.Mesh( geometry, material );
  119. object.position.set( - 200, 100, 0 );
  120. object.scale.multiplyScalar( 1 );
  121. group.add( object );
  122. //
  123. renderer = new THREE.WebGLRenderer( { antialias: true } );
  124. renderer.setPixelRatio( window.devicePixelRatio );
  125. renderer.setSize( window.innerWidth, window.innerHeight );
  126. container.appendChild( renderer.domElement );
  127. stats = new Stats();
  128. container.appendChild( stats.dom );
  129. document.addEventListener( 'mousedown', onDocumentMouseDown, false );
  130. document.addEventListener( 'touchstart', onDocumentTouchStart, false );
  131. document.addEventListener( 'touchmove', onDocumentTouchMove, false );
  132. //
  133. window.addEventListener( 'resize', onWindowResize, false );
  134. }
  135. function onWindowResize() {
  136. windowHalfX = window.innerWidth / 2;
  137. camera.aspect = window.innerWidth / window.innerHeight;
  138. camera.updateProjectionMatrix();
  139. renderer.setSize( window.innerWidth, window.innerHeight );
  140. }
  141. //
  142. function onDocumentMouseDown( event ) {
  143. event.preventDefault();
  144. document.addEventListener( 'mousemove', onDocumentMouseMove, false );
  145. document.addEventListener( 'mouseup', onDocumentMouseUp, false );
  146. document.addEventListener( 'mouseout', onDocumentMouseOut, false );
  147. mouseXOnMouseDown = event.clientX - windowHalfX;
  148. targetRotationOnMouseDown = targetRotation;
  149. }
  150. function onDocumentMouseMove( event ) {
  151. mouseX = event.clientX - windowHalfX;
  152. targetRotation = targetRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.02;
  153. }
  154. function onDocumentMouseUp() {
  155. document.removeEventListener( 'mousemove', onDocumentMouseMove, false );
  156. document.removeEventListener( 'mouseup', onDocumentMouseUp, false );
  157. document.removeEventListener( 'mouseout', onDocumentMouseOut, false );
  158. }
  159. function onDocumentMouseOut() {
  160. document.removeEventListener( 'mousemove', onDocumentMouseMove, false );
  161. document.removeEventListener( 'mouseup', onDocumentMouseUp, false );
  162. document.removeEventListener( 'mouseout', onDocumentMouseOut, false );
  163. }
  164. function onDocumentTouchStart( event ) {
  165. if ( event.touches.length == 1 ) {
  166. event.preventDefault();
  167. mouseXOnMouseDown = event.touches[ 0 ].pageX - windowHalfX;
  168. targetRotationOnMouseDown = targetRotation;
  169. }
  170. }
  171. function onDocumentTouchMove( event ) {
  172. if ( event.touches.length == 1 ) {
  173. event.preventDefault();
  174. mouseX = event.touches[ 0 ].pageX - windowHalfX;
  175. targetRotation = targetRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.05;
  176. }
  177. }
  178. //
  179. function animate() {
  180. requestAnimationFrame( animate );
  181. render();
  182. stats.update();
  183. }
  184. function render() {
  185. group.rotation.y += ( targetRotation - group.rotation.y ) * 0.05;
  186. renderer.render( scene, camera );
  187. }
  188. </script>
  189. </body>
  190. </html>