更新找到问题的原因 - 请参阅更新部分的结尾。
我有一个使用THREE.js（r60）的复杂应用程序，它为主场景添加了一个特殊的平面对象。平面几何形状由内部提供的base64 uri图像（尺寸为16x16,32x32或64x64像素）的高度映射确定。场景有两个静态灯（环境和方向）和一个可打开和关闭的可移动点灯。
在complex app 点光线未被平面物体反射。 （按“R”键或按钮切换点光源。
我使用THREE.js最新版本（r70）制作了first JSFiddle example，其中灯光正常。
[更新]我现在使用较旧的THREE.js库（r60）制作了second JSFiddle example它也可以正常工作。
我怀疑复杂应用程序（r60）中的问题可能与系统容量和/或时序/顺序有关。容量肯定是一个问题，因为其他更简单的场景对象（盒子和柱面）显示单独的响应或对点光的不响应，从应用程序的一次运行到下一次运行，看起来取决于系统活动的整体水平（cpu，内存使用情况）。这些更简单的对象可能在一次运行中反映，但在下一次运行中不反映但是高度映射的平面对象始终对点光不反射。在（i）Win7笔记本电脑和（ii）Android Kitkat平板电脑上观察到这些行为。
高度映射过程可能是原因的一部分。我这样说是因为当我注释出高度映射的平面并激活一个简单的类似平面物体（随机分配的z-水平）时，后一个平面表现得如预期的那样（即它反射点光）。
我想通常的方法是将我的复杂应用程序升级到r70（不是一个简单的步骤），然后开始禁用应用程序的块来缩小原因。然而，实现高度映射的方式（例如，使用回调）可能是解释高度映射平面无法反射点光的一个因素。
[RE-WRITTEN]如果有人能够看一下正确工作的，先前引用的（r70）JSFiddle example中的代码，并指出任何明显的设计缺陷（如果有的话），我将不胜感激。应用于更复杂，重载的应用程序）可能会导致高度映射平面无法反射点光。
（r70）JSFiddle的完整代码（javascript，而不是html或css）： -
//... Heightmap from Image file
//... see http://danni-three.blogspot.co.uk/2013/09/threejs-heightmaps.html
var camera, scene, renderer;
var lpos_x = -60,lpos_y = 20,lpos_z = 100;
var mz = 1;
var time = 0, dt = 0;
var MyPlane, HPlane;
base64_imgData = "data:image/jpeg;base64,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";
init();
animate();
//==================================================================
function init() {
scene = new THREE.Scene();
camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 10);
camera.position.x = 1300;
camera.position.y = 400;
camera.position.z = 0;
camera.lookAt(0, 0, 0);
scene.add(camera);
scene.add(new THREE.AmbientLight(0x001900));
SunLight = new THREE.DirectionalLight(0xff0000,.3,20000);//...color, intensity, range.
SunLight.position.set(0, 3000, -8000);
scene.add(SunLight);
//POINT LIGHT
PL_color = 0x0000ff;
PL_intensity = 10;
PL_range_to_zero_intensity = 1200;
PL = new THREE.PointLight(PL_color, PL_intensity, PL_range_to_zero_intensity);
scene.add(PL);
PL_pos_x = -100;
PL_pos_y = -100;
PL_pos_z = 120;
PL.position.set(PL_pos_x, PL_pos_y, PL_pos_z);
//INDICATOR SPHERE
var s_Geometry = new THREE.SphereGeometry(5, 20, 20);
var s_Material = new THREE.MeshBasicMaterial({
color: 0xaaaaff
});
i_Sphere = new THREE.Mesh(s_Geometry, s_Material);
i_Sphere.position.set(PL_pos_x, PL_pos_y, PL_pos_z);
scene.add(i_Sphere);
//Plane02
var Plane02Geo = new THREE.PlaneGeometry(50, 50); //...
var Plane02Material = new THREE.MeshPhongMaterial({
side: THREE.DoubleSide
}, {
color: 0xaaaaaa
});
Plane02 = new THREE.Mesh(Plane02Geo, Plane02Material);
Plane02.position.set(0, 0, -120);
scene.add(Plane02);
//PEAS
xxx = SOW_F_Make_peas();
//RENDERER
renderer = new THREE.WebGLRenderer({
antialias: true
});
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.shadowMapEnabled = true;
renderer.shadowMapSoft = false;
document.body.appendChild(renderer.domElement);
// controls
controls = new THREE.OrbitControls(camera, renderer.domElement);
xxx = SOW_F_Make_Heightmap_Object_from_Image_File(scene, camera);
} //...EOFunction Init
//==================================================================
function animate() {
dt = 0.1;
time += dt;
if (time < 10000) {
requestAnimationFrame(animate);
//move point light & indicator sphere
speed = 16;
if (Math.abs(PL_pos_z) > 400) mz = (-1)* mz;
PL_pos_x += 0.01 * speed * mz;
PL_pos_y += 0.05 * speed * mz;
PL_pos_z -= 0.2 * speed * mz;
PL.position.set(PL_pos_x, PL_pos_y, PL_pos_z);
i_Sphere.position.set(PL_pos_x, PL_pos_y, PL_pos_z);
renderer.render(scene, camera);
} else alert("Time=" + time + "Finished");
}
//==================================================================
function SOW_F_Make_Heightmap_Object_from_Image_File(givenScene, givenCamera) {
//... Read a Heightmap from a coloured image file
//... into a (pre-defined global) plane object called HPlane
MyImage = new Image();
MyImage.onload = function () {
var MyPlane_width = 1000;//6000; //...MyPlane width or height are in scene units and do not have to match image width or height
var MyPlane_height = 1000;//6000;
var MyPlane_w_segs = MyImage.naturalWidth - 1; //... important that this mapping is correct for texture 1 pixel :: 1 segment.
var MyPlane_h_segs = MyImage.naturalHeight - 1; //... important that this mapping is correct for texture 1 pixel :: 1 segment.
var Hgeometry = new THREE.PlaneGeometry(MyPlane_width, MyPlane_height, MyPlane_w_segs, MyPlane_h_segs);
//var texture = THREE.ImageUtils.loadTexture( '/images/Tri_VP_Texturemap.jpg' );
var texture = THREE.ImageUtils.loadTexture( base64_imgData );
//... Choose texture or color
//var Hmaterial = new THREE.MeshLambertMaterial( { map: texture, side: THREE.DoubleSide} );//....fails
var Hmaterial = new THREE.MeshPhongMaterial( {
color: 0x111111 , side: THREE.DoubleSide } ); //... works OK
HPlane = new THREE.Mesh(Hgeometry, Hmaterial);
//...get Height Data from Image
var scale = 0.6;//1//6; //0.25;
var Height_data = DA_getHeightData(MyImage, scale);
//... set height of vertices
X_offset = 0;
Y_offset = 0;
Z_offset = -100; //...this will (after rotation) add to the vertical height dimension (+ => up).
for (var iii = 0; iii < HPlane.geometry.vertices.length; iii++) {
//HPlane.geometry.vertices[iii].x = X_offset;
//HPlane.geometry.vertices[iii].y = Y_offset;
HPlane.geometry.vertices[iii].z = Z_offset + Height_data[iii];
}
//----------------------------------------------------------------------
//... Must do it in this order...Faces before Vertices
//... see WestLangley's response in http://stackoverflow.com/questions/13943907/my-object-isnt-reflects-the-light-in-three-js
HPlane.rotation.x = (-(Math.PI) / 2); //... rotate MyPlane -90 degrees on X
//alert("Rotated");
HPlane.geometry.computeFaceNormals(); //... for Lambert & Phong materials
HPlane.geometry.computeVertexNormals(); //... for Lambert & Phong materials
/*
HPlane.updateMatrixWorld();
HPlane.matrixAutoUpdate = false;
HPlane.geometry.verticesNeedUpdate = true;
*/
givenScene.add(HPlane);
HPlane.position.set(0, -150, 0);//... cosmetic
//return HPlane; //... not necessary, given that HPlane is global.
} ; //... End of MyImage.onload = function ()
//===============================================================
//... *** IMPORTANT ***
//... Only NOW do we command the script to actually load the image source
//... This .src statement will load the image from file into MyImage object
//... and invoke the pre-associated MyImage.OnLoad function
//... cause cross-origin problem: MyImage.src = '/images/Tri_VP_Heightmap_64x64.jpg'; //...if image file is local to this html file.
MyImage.src = base64_imgData;//... uses image data provided in the script to avoid Cross-origin file source restrictions.
} //... End of function SOW_F_Make_Heightmap_Object_from_Image_File
//===========================================================================
function DA_getHeightData(d_img, scale) {
//... This is used by function SOW_F_Make_Heightmap_Object_from_Image_File.
//if (scale == undefined) scale=1;
var canvas = document.createElement('canvas');
canvas.width = d_img.width; //OK
canvas.height = d_img.height;
var context = canvas.getContext('2d');
var size = d_img.width * d_img.height;
var data = new Float32Array(size);
context.drawImage(d_img, 0, 0);
for (var ii = 0; ii < size; ii++) {
data[ii] = 0;
}
var imgData = context.getImageData(0, 0, d_img.width, d_img.height);
var pix = imgData.data; //... Uint(8) UnClamped Array[1024] for a 16x16 = 256 pixel image = 4 slots per pixel.
var jjj = 0;
//... presumably each pix cell can have value 0 to 255
for (var iii = 0; iii < pix.length; iii += 4) {
var all = pix[iii] + pix[iii + 1] + pix[iii + 2];
//... I guess RGBA and we don't use the fourth cell (A, = Alpha channel)
jjj++;
data[jjj] = all * scale / 3; //...original code used 12 not 3 ??? and divided by scale.
//console.log (iii, all/(3*scale), data[jjj]);
}
return data;
} //... end of function DA_getHeightData(d_img,scale)
//==================================================================================================
function SOW_F_Get_A_Plane(givenScene, givenCamera) {
//...MyPlane width or height are in scene units and do not have to match image width or height
var MyPlane_width = 1000;
var MyPlane_height = 1000;
var MyPlane_w_segs = 64; //...
var MyPlane_h_segs = 64; //...
geometry = new THREE.PlaneGeometry(MyPlane_width, MyPlane_height, MyPlane_w_segs, MyPlane_h_segs);
//var material = new THREE.MeshLambertMaterial( { color: 0xeeee00, side: THREE.DoubleSide} );
var material = new THREE.MeshPhongMaterial({
color: 0xeeee00,side: THREE.DoubleSide
}); //... OK
MyPlane = new THREE.Mesh(geometry, material);
givenScene.add(MyPlane);
MyPlane.rotation.x = (-(Math.PI) / 2); // rotate it -90 degrees on X
MyPlane.position.set(0, 100, 0);
MyPlane.geometry.computeFaceNormals(); //...for Lambert & Phong materials
MyPlane.geometry.computeVertexNormals(); //...for Lambert & Phong materials
/*
MyPlane.geometry.verticesNeedUpdate = true;
MyPlane.updateMatrixWorld();
MyPlane.matrixAutoUpdate = false;
*/
} //... EOF SOW_F_Get_A_Plane
//====================================================================
function SOW_F_Make_peas()
{
//----------------- Make an array of spheres -----------------------
Pea_geometry = new THREE.SphereGeometry(5,16,16);
//Pea_material = new THREE.MeshNormalMaterial({ shading: THREE.SmoothShading});
Pea_material = new THREE.MeshPhongMaterial({ color: 0xaa5522});
// global...
num_peas = 1200;
for (var iii = 0; iii < num_peas; iii++)
{
//...now global
ob_Pea = new THREE.Mesh(Pea_geometry, Pea_material);
ob_Pea.position.set(
400 * Math.random() - 150,
300 * Math.random() - 150,
1200 * Math.random() - 150);
scene.add(ob_Pea);//TEST
}
}
更新
问题似乎是分阶段的结果。见new JSFiddle(r70)。 Pointlight在函数init（）中创建，但不会添加到场景中，或者在添加后立即从场景中删除。然后创建各种图形网格对象。当点光源添加回场景时（在动画循环中）为时已晚 - 点光源不会照亮网格物体。
程序解决方案只是在以后要使用场景中时不从场景中移除点光源。如果他们需要暂时“熄灭”，那么只需调低强度并稍后将其打开：例如：
myPointLight.intensity = 0.00