In the Ray Design Agents documentation the Ray Perception parameter Ray Layer Mask is not mentioned. I am a bit confused about what does it do and if it interacts with the Detectable Tags parameter.

![Screenshot from 2020-04-12 18-57-18](https://user-images.githubusercontent.com/3236037

Great tutorial! It clears up a lot of my questions about various effects.

Minor complaint: Focal length is size of the lens. Focal distance is the distance between the camera and the focal point.

pyscript文件夹下建立一个头文件， 命名为
py_docs.h:

PyDoc_STRVAR(createCellEntity_docs,
"sha3_512([data]) -> SHA3 object\n\
\n\
Return a new SHA3 hash object with a hashbit length of 64 bytes.");

PyDoc_STRVAR(createCellEntityInNewSpace_docs,
"sha3_512([data]) -> SHA3 object\n\
\n\
Return a new SHA3 hash object with a hashbit length of 64 bytes.");

然后将所有api的英文描述写入，PyDoc_STRVAR。
未来如果有其他文档

(请尽量按照下面提示内容填写，有助于我们快速定位和解决问题，感谢配合。否则直接关闭。)

(重要！问题分类)

• 测试开发环境AirtestIDE使用问题 -> https://github.com/AirtestProject/AirtestIDE/issues
• 控件识别、树状结构、poco库报错 -> https://github.com/AirtestProject/Poco/issues
• 图像识别、设备控制相关问题 -> 按下面的步骤

描述问题bug
(简洁清晰得概括一下遇到的问题是什么。或者是报错的traceback信息。)

Linux执行airtest脚本报"There is no SIFT module in your OpenCV environment！"

根据https://github.com/AirtestPr

What would you like to submit? (put an 'x' inside the bracket that applies)

• [x ] question
• bug report
• feature request

Issue description

Is the matrix-matrix multiplication function (Dot(matrixA, matrixB)) documented anywhere? I can't find the documentation on the accord-framework.net website and the code appears to be generated from .tt files.

The ability to move around by rolling a hamster ball

Like this: https://gfycat.com/OpulentExhaustedGoldenretriever

I'll try and contact the author on reddit: https://www.reddit.com/user/Reil

The title is pretty much self-explanatory. This feels like an amazing solution for UI authoring but Non-Chinese speaking folks like myself are struggling to understand how it works. Please translate it, it's been a long time since this is out.

Need to document this page http://docs.forgepowered.com/UnityIntegration/network-object-without-prefab

Althougt code can be commented in the scripts, could be great to generate automatic documentation for the scripts and host it in the gh-pages branch of this repository.

In this way we can have a presentation web for the library and also the related documentation on how the API works.

I have checked DocFX and it seems it's possible to implement the pipeline for hosting the documentation as st

Remove any following parts if does not have details about

Describe the bug
在测试poco官方提供的tutorial的时候，总是出现错误，按照这个代码运行的时候，拖动星星的顺序是从左到右第一个，第三个，第五个，然后就运行不下去了，甚至在拖动第三个的时候也停止了，

![qq 20190306170237](https://user-images.githubusercontent.com/18191658/53869373-0e5d0e00-4033-11e