webgl_geometry_nurbs.html 7.7 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. <style>
  8. body {
  9. font-family: Monospace;
  10. background-color: #f0f0f0;
  11. margin: 0px;
  12. overflow: hidden;
  13. }
  14. #info {
  15. position: absolute;
  16. top: 0px;
  17. width: 100%;
  18. padding: 5px;
  19. text-align:center;
  20. }
  21. </style>
  22. </head>
  23. <body>
  24. <canvas id="debug" style="position:absolute; left:100px"></canvas>
  25. <div id="info"><a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - NURBS curve and surface example</div>
  26. <script src="../build/three.js"></script>
  27. <script src="js/curves/NURBSCurve.js"></script>
  28. <script src="js/curves/NURBSSurface.js"></script>
  29. <script src="js/curves/NURBSUtils.js"></script>
  30. <script src="js/libs/stats.min.js"></script>
  31. <script>
  32. var container, stats;
  33. var camera, scene, renderer;
  34. var group;
  35. var targetRotation = 0;
  36. var targetRotationOnMouseDown = 0;
  37. var mouseX = 0;
  38. var mouseXOnMouseDown = 0;
  39. var windowHalfX = window.innerWidth / 2;
  40. var windowHalfY = window.innerHeight / 2;
  41. init();
  42. animate();
  43. function init() {
  44. container = document.createElement( 'div' );
  45. document.body.appendChild( container );
  46. var info = document.createElement( 'div' );
  47. info.style.position = 'absolute';
  48. info.style.top = '30px';
  49. info.style.width = '100%';
  50. info.style.textAlign = 'center';
  51. info.innerHTML = 'Drag to spin';
  52. container.appendChild( info );
  53. camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 2000 );
  54. camera.position.set( 0, 150, 750 );
  55. scene = new THREE.Scene();
  56. scene.background = new THREE.Color( 0xf0f0f0 );
  57. scene.add( new THREE.AmbientLight( 0x808080 ) );
  58. var light = new THREE.DirectionalLight( 0xffffff, 1 );
  59. light.position.set( 1, 1, 1 );
  60. scene.add( light );
  61. group = new THREE.Group();
  62. group.position.y = 50;
  63. scene.add( group );
  64. // NURBS curve
  65. var nurbsControlPoints = [];
  66. var nurbsKnots = [];
  67. var nurbsDegree = 3;
  68. for ( var i = 0; i <= nurbsDegree; i ++ ) {
  69. nurbsKnots.push( 0 );
  70. }
  71. for ( var i = 0, j = 20; i < j; i ++ ) {
  72. nurbsControlPoints.push(
  73. new THREE.Vector4(
  74. Math.random() * 400 - 200,
  75. Math.random() * 400,
  76. Math.random() * 400 - 200,
  77. 1 // weight of control point: higher means stronger attraction
  78. )
  79. );
  80. var knot = ( i + 1 ) / ( j - nurbsDegree );
  81. nurbsKnots.push( THREE.Math.clamp( knot, 0, 1 ) );
  82. }
  83. var nurbsCurve = new THREE.NURBSCurve( nurbsDegree, nurbsKnots, nurbsControlPoints );
  84. var nurbsGeometry = new THREE.BufferGeometry();
  85. nurbsGeometry.setFromPoints( nurbsCurve.getPoints( 200 ) );
  86. var nurbsMaterial = new THREE.LineBasicMaterial( { linewidth: 10, color: 0x333333 } );
  87. var nurbsLine = new THREE.Line( nurbsGeometry, nurbsMaterial );
  88. nurbsLine.position.set( 200, - 100, 0 );
  89. group.add( nurbsLine );
  90. var nurbsControlPointsGeometry = new THREE.BufferGeometry();
  91. nurbsControlPointsGeometry.setFromPoints( nurbsCurve.controlPoints );
  92. var nurbsControlPointsMaterial = new THREE.LineBasicMaterial( { linewidth: 2, color: 0x333333, opacity: 0.25, transparent: true } );
  93. var nurbsControlPointsLine = new THREE.Line( nurbsControlPointsGeometry, nurbsControlPointsMaterial );
  94. nurbsControlPointsLine.position.copy( nurbsLine.position );
  95. group.add( nurbsControlPointsLine );
  96. // NURBS surface
  97. var nsControlPoints = [
  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. new THREE.Vector4 ( 0, -200, 0, 1 ),
  106. new THREE.Vector4 ( 0, -100, -100, 5 ),
  107. new THREE.Vector4 ( 0, 100, 150, 5 ),
  108. new THREE.Vector4 ( 0, 200, 0, 1 )
  109. ],
  110. [
  111. new THREE.Vector4 ( 200, -200, -100, 1 ),
  112. new THREE.Vector4 ( 200, -100, 200, 1 ),
  113. new THREE.Vector4 ( 200, 100, -250, 1 ),
  114. new THREE.Vector4 ( 200, 200, 100, 1 )
  115. ]
  116. ];
  117. var degree1 = 2;
  118. var degree2 = 3;
  119. var knots1 = [0, 0, 0, 1, 1, 1];
  120. var knots2 = [0, 0, 0, 0, 1, 1, 1, 1];
  121. var nurbsSurface = new THREE.NURBSSurface(degree1, degree2, knots1, knots2, nsControlPoints);
  122. var map = new THREE.TextureLoader().load( 'textures/UV_Grid_Sm.jpg' );
  123. map.wrapS = map.wrapT = THREE.RepeatWrapping;
  124. map.anisotropy = 16;
  125. function getSurfacePoint( u, v, target ) {
  126. return nurbsSurface.getPoint( u, v, target );
  127. }
  128. var geometry = new THREE.ParametricBufferGeometry( getSurfacePoint, 20, 20 );
  129. var material = new THREE.MeshLambertMaterial( { map: map, side: THREE.DoubleSide } );
  130. var object = new THREE.Mesh( geometry, material );
  131. object.position.set( - 200, 100, 0 );
  132. object.scale.multiplyScalar( 1 );
  133. group.add( object );
  134. //
  135. renderer = new THREE.WebGLRenderer( { antialias: true } );
  136. renderer.setPixelRatio( window.devicePixelRatio );
  137. renderer.setSize( window.innerWidth, window.innerHeight );
  138. container.appendChild( renderer.domElement );
  139. stats = new Stats();
  140. container.appendChild( stats.dom );
  141. document.addEventListener( 'mousedown', onDocumentMouseDown, false );
  142. document.addEventListener( 'touchstart', onDocumentTouchStart, false );
  143. document.addEventListener( 'touchmove', onDocumentTouchMove, false );
  144. //
  145. window.addEventListener( 'resize', onWindowResize, false );
  146. }
  147. function onWindowResize() {
  148. windowHalfX = window.innerWidth / 2;
  149. windowHalfY = window.innerHeight / 2;
  150. camera.aspect = window.innerWidth / window.innerHeight;
  151. camera.updateProjectionMatrix();
  152. renderer.setSize( window.innerWidth, window.innerHeight );
  153. }
  154. //
  155. function onDocumentMouseDown( event ) {
  156. event.preventDefault();
  157. document.addEventListener( 'mousemove', onDocumentMouseMove, false );
  158. document.addEventListener( 'mouseup', onDocumentMouseUp, false );
  159. document.addEventListener( 'mouseout', onDocumentMouseOut, false );
  160. mouseXOnMouseDown = event.clientX - windowHalfX;
  161. targetRotationOnMouseDown = targetRotation;
  162. }
  163. function onDocumentMouseMove( event ) {
  164. mouseX = event.clientX - windowHalfX;
  165. targetRotation = targetRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.02;
  166. }
  167. function onDocumentMouseUp( event ) {
  168. document.removeEventListener( 'mousemove', onDocumentMouseMove, false );
  169. document.removeEventListener( 'mouseup', onDocumentMouseUp, false );
  170. document.removeEventListener( 'mouseout', onDocumentMouseOut, false );
  171. }
  172. function onDocumentMouseOut( event ) {
  173. document.removeEventListener( 'mousemove', onDocumentMouseMove, false );
  174. document.removeEventListener( 'mouseup', onDocumentMouseUp, false );
  175. document.removeEventListener( 'mouseout', onDocumentMouseOut, false );
  176. }
  177. function onDocumentTouchStart( event ) {
  178. if ( event.touches.length == 1 ) {
  179. event.preventDefault();
  180. mouseXOnMouseDown = event.touches[ 0 ].pageX - windowHalfX;
  181. targetRotationOnMouseDown = targetRotation;
  182. }
  183. }
  184. function onDocumentTouchMove( event ) {
  185. if ( event.touches.length == 1 ) {
  186. event.preventDefault();
  187. mouseX = event.touches[ 0 ].pageX - windowHalfX;
  188. targetRotation = targetRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.05;
  189. }
  190. }
  191. //
  192. function animate() {
  193. requestAnimationFrame( animate );
  194. render();
  195. stats.update();
  196. }
  197. function render() {
  198. group.rotation.y += ( targetRotation - group.rotation.y ) * 0.05;
  199. renderer.render( scene, camera );
  200. }
  201. </script>
  202. </body>
  203. </html>