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ThreeJS Points (Point Cloud) with Lighting using custom Shader Material

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本文的目的是介绍ThreeJSPoints(PointCloud)withLightingusingcustomShaderMaterial的详细情况，我们将通过专业的研究、有关数据的分析等多种方式，

本文的目的是介绍ThreeJS Points (Point Cloud) with Lighting using custom Shader Material的详细情况，我们将通过专业的研究、有关数据的分析等多种方式，同时也不会遗漏关于102.You want to import schema objects of the HR user using Oracle Data Pump from the development dat、116. Populating Next Right Pointers in Each Node、Alias "bootstrap.widgets.TbHeroUnit" is invalid. Make sure it points to an existing PHP file and the、Australia to focus on blockchain potential with new roadmap的知识。

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ThreeJS Points (Point Cloud) with Lighting using custom Shader Material

ThreeJS Points (Point Cloud) with Lighting using custom Shader Material

如何解决ThreeJS Points (Point Cloud) with Lighting using custom Shader Material？

编码使用：

  • 使用 ThreeJS v0.130.1
  • 框架：Angular 12，但这与问题无关。
  • 在 Chrome 浏览器上测试。

我正在构建一个获得超过 100K 积分的应用程序。我使用这些点在屏幕上渲染一个 THREE.Points 对象。

我发现默认的 THREE.PointsMaterial 不支持照明（无论是否向场景添加灯光，这些点都是可见的）。

所以我尝试实现一个自定义的ShaderMaterial。但是我找不到向渲染对象添加光照的方法。

这是我的代码正在执行的操作的示例： Sample App on StackBlitz showing my current attempt 在这段代码中，我使用了点云数据、法线和颜色的示例值，但其他一切都与我的实际应用程序相似。我可以看到 3D 对象，但需要使用法线进行更适当的照明。

我需要帮助或指导来实施以下内容：

  1. 为自定义着色器材质添加光照。我在谷歌上搜索并尝试了很多东西，但到目前为止都没有成功。

  2. 使用法线，展示光照效果（本示例代码中，法线固定在Y轴方向，但我在实际应用中是根据一些向量逻辑计算的）。所以计算法线已经完成，但我想用它们来显示自定义着色器材质中的光照/阴影效果。

在此示例中，颜色属性设置为固定的红色，但在实际应用中，我可以使用从纹理到颜色属性的 UV 范围来应用颜色。

请告知我如何/是否可以根据点云的法线获得照明。谢谢。

注意：我看过这个 Stackoveflow question，但它只处理改变点的 alpha/透明度而不是照明。

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。

小编邮箱:dio#foxmail.com (将#修改为@）

102.You want to import schema objects of the HR user using Oracle Data Pump from the development dat

102.You want to import schema objects of the HR user using Oracle Data Pump from the development dat

102.You want to import schema objects of the HR user using Oracle Data Pump from the development database,DEVDB,to the production database,PRODDB. A database link devdb.us.oracle.com is created between PRODDB and DEVDB. You execute the following command on the PRODDB database server: $ impdp system/manager directory = DB_DATA dumpfile = schemas.dat schemas = hr flashback_time = "TO_TIMESTAMP('25-08-2007 14:35:00','DD-MM-YYYY HH24:MI:SS')" The command fails displaying the following error: ORA-39001: invalid argument value ORA-39000: bad dump file specification ORA-31640: unable to open dump file "/home/oracle/schema/schemas.dat" for read ORA-27037: unable to obtain file status What would you do to overcome the error? A.Add the user,SYstem,to the schemas option. B.Add the network_link = devdb.us.oracle.com option. C.Change the dumpfile option to schema.dat@devdb.us.oracle.com. D.Replace the schemas option with the network_link = devdb.us.oracle.com option. E.Replace the dumpfile option with the network_link = devdb.us.oracle.com option. 答案：E 解析：这道题主要问的是远程导入，我们测试一下远程导入和导出 这里需要注意的是network_link和dumpfile不能同时出现，如果远程导入的话，并且数据文件不在被导入的服务器本地的话，那么 必须使用network_link，还有一种方法，那就是先导入本地，然后通过network_link导入目标数据库 impdp导入远程数据库 1.impdp system/oracle@test3 directory=data_pump_dir dumpfile=test.dmp logfile=log.log tables=test.dept; 这里directory指的是远程的目录，dumpfile指的是远程的文件 2.如果dmp文件在本地，那么只能通过使用network_link来进行操作 客户端A:wahaha3，存在test 服务端B:wahaha7，不存在test 在B上执行，impdp system/oracle directory=data_pump_dir logfile=log.log network_link='dblink3' schemas=test remap_tablespace=test:users; --这里需要注意，这个impdp是在目标端执行的，直接从远程客户机test导过来，说明还是在服务器上 在A上执行，impdp system/oracle@wahaha7 directory=data_pump_dir logfile=log.log network_link='dblink3' schemas=test remap_tablespace=test:users; 总结：这里impdp 连接的哪个库，就给哪个库里面导入,network_link是连接到的数据库的link expdp导出 在wahaha7上导出wahaha3的东西 1.wahaha7上创建public database link sql> CREATE PUBLIC DATABASE LINK dblink3 2 CONNECT TO system 3 IDENTIFIED BY oracle 4 using 'TEST3'; [oracle@wahaha7 ~]$ expdp system/oracle directory=data_pump_dir dumpfile=test.dmp logfile=log.log network_link='dblink3' schemas=test; directory==wahaha7的目录 dumpfile==wahaha7的文件 network_link==连接wahaha3的dblink --这个时候出成功，并且本地数据库中并没有导入test账号，这里使用system/oracle估计是使用dblink

116. Populating Next Right Pointers in Each Node

116. Populating Next Right Pointers in Each Node

Given a binary tree

struct TreeLinkNode { TreeLinkNode *left; TreeLinkNode *right; TreeLinkNode *next; }

Populate each next pointer to point to its next right node. If there is no next right node, the next pointer should be set to NULL.

Initially, all next pointers are set to NULL.

Note:

  • You may only use constant extra space.
  • You may assume that it is a perfect binary tree (ie, all leaves are at the same level, and every parent has two children).

For example,
Given the following perfect binary tree,

1 / \ 2 3 / \ / \ 4 5 6 7

After calling your function, the tree should look like:

1 -> NULL / \ 2 -> 3 -> NULL / \ / \ 4->5->6->7 -> NULL

1.我的解答 层次遍历

由于受之前某个答案的启发，用层次遍历法+队列，并记录每层的个数，当个数大于0时，就将当前的节点的next指向队列队头的元素；若个数等于0，则将当前节点的next指向NULL。

/**
    • * Definition for binary tree with next pointer.
    • * struct TreeLinkNode {
    • * int val;
    • * TreeLinkNode *left, *right, *next;
  • * TreeLinkNode(int x) : val(x), left(NULL), right(NULL), next(NULL) {}
  • * };
  • */
  • class Solution {
  • public:
  • void connect(TreeLinkNode *root) {
  • if(root==NULL)
  • return;
  • queue<TreeLinkNode*> q;
  • int count = 1;
  • q.push(root);
  • while(!q.empty()){
  • TreeLinkNode* t = q.front();
  • q.pop();
  • if(t->left)
  • q.push(t->left);
  • if(t->right)
  • q.push(t->right);
  • count--;
  • if(count > 0){
  • TreeLinkNode* tt = q.front();
  • t->next = tt;
  • }else{
  • t->next = NULL;
  • count = q.size();
  • }
  • }
  • }
  • };

    • 2.也是层次的遍历，比我的简单 

    1. void connect(TreeLinkNode *root) {
    2.     if(!root)
    3.         return;
    4.     while(root -> left)
    5.     {
    6.         TreeLinkNode *p = root;
    7.         while(p)
    8.         {
    9.             p -> left -> next = p -> right;
    10.             if(p -> next)
    11.                 p -> right -> next = p -> next -> left;
    12.             p = p -> next;
    13.         }
    14.         root = root -> left;
    15.     }
    16. }


    Alias

    Alias "bootstrap.widgets.TbHeroUnit" is invalid. Make sure it points to an existing PHP file and the

    总结

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    如果觉得小编网站内容还不错，欢迎将小编网站推荐给好友。

    Australia to focus on blockchain potential with new roadmap

    Australia to focus on blockchain potential with new roadmap

    http://www.zdnet.com/article/australia-to-focus-on-blockchain-potential-with-new-roadmap/


    The Australian government believes there are opportunities across the economy that can be seized and enabled by the use of blockchain technology.

    The government, in its 52-page blockchain roadmap [PDF], says the technology has the potential to create jobs, create new economic growth, save businesses money, and improve the nation''s overall productivity.

    See also: Blockchain: A cheat sheet (TechRepublic)

    The roadmap, The National Blockchain Roadmap: Progressing towards a blockchain-empowered future, focuses on three areas: Regulation and standards; skills, capability, and innovation; and international investment and collaboration.

    The roadmap is comprised of 12 steps the government hopes to execute before the end of 2025. The first is to formalise the National Blockchain Roadmap Advisory Committee and rename it the National Blockchain Roadmap Steering Committee.

    One of the responsibilities of the committee would be to provide advice regarding existing government programs and what support is available to the sector. It would also be required to work with other committees, such as the Treasury Fintech Advisory Committee.

    It would also be tasked with providing advice to government on the next two blockchain use cases that would be explored.

    Step number two of the roadmap is progressing work on those next two use cases through working alongside industry, the research sector, and government.

    With three use cases highlighted in the roadmap, which includes the use of blockchain in the agriculture sector, with a focus on supply chains and wine exports; the education sector, with a focus on trusted credentials and facilitating trusted information about an individual''s skills and capabilities; and the financial sector, with a focus on identify checks, specifically Know Your Customer (KYC) checks -- the third step is to investigate options for progressing them.

    It is expected the establishment of a group of government blockchain users would see discussions on the learnings from existing government use cases; and that all involved would look internationally to identify examples of countries using blockchain to provide efficient government services, such as Estonia, for learnings for Australia.

    See also: e-Estonia: What is all the fuss about?

    The roadmap also asks for those involved to work closely with blockchain providers, as well as to ensure that blockchain is included in broader policy work to "increase management capability around digital technologies".

    Roadmap item number eight asks for industry and educational institutions to work together to "develop common frameworks and course content for blockchain qualifications".

    Similarly, working alongside Austrade, the roadmap envisions a "capability development program" to be stood up for Australian blockchain startups so they can go global with their ideas. Austrade would also be involved, alongside the government, in a blockchain-focussed "inbound investment program" aimed at introducing potential investors to the Australian blockchain ecosystem.

    "This roadmap highlights some of the enormous opportunities blockchain technology can enable -- across our whole economy, not just in the financial sector," Minister for Industry, Science and Technology Karen Andrews said in her foreword.

    "These opportunities include supply chains and logistics; agriculture; trusted credentials; and smart contracts -- just to name a few. Australia has some real strengths in blockchain technology, from our world-class research to our innovative companies to our leading role in the development of international standards for blockchain."

    "Blockchain is a technology with real potential to save businesses money and to open new business and export opportunities," she added, calling it the "start of the conversation between government, industry, and universities".

    In preparing its roadmap, the government looked into 138 blockchain activities in Australia, which revealed activity mostly came from small-to-medium sized businesses in New South Wales and Victoria. The financial and insurance services had the most activity.  

    chrome-so8lv7aydu.png

    Share of Australian blockchain activities, by industry

    See also: Commonwealth Bank to trial blockchain ''BioTokens'' for biodiversity investment

    The roadmap follows the Digital Transformation Agency (DTA) giving advice over a year ago to those getting lost in the buzz of blockchain that they should turn their attention elsewhere.

    DTA chief digital officer Peter Alexander also dunked on its use, adding to the above that "for every use of blockchain you would consider today, there is a better technology -- alternate databases, secure connections, standardised API engagement".

    "Blockchain: Interesting technology but early on in its development, it''s kind of at the top of a hype cycle," he said.

    The government entity has even published a questionnaire for organisations to self-evaluate before bothering with something that can just be stored in a secure database.

    MORE BLOCKCHAIN IN AUSTRALIA

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