Detail this plugin from Unity Store: Original Link
This is a paid plugin, but now you can download PixyzPlugin Free.
PiXYZ for Unity v2019.2.0.59
With PiXYZ is best-in-class software, you can quickly import, prep, and optimize your large CAD, mesh and point cloud models for real-time visualizations in Unity.
1. IMPORT ANY CAD MODEL
With PixyzPlugin, import a native CAD file (CATPart, SolidWorks, JT, STEP…) within Unity 3D Editor.
See formats supported in PixyzPlugin.
Use Pixyz powerful CAD import settings to obtain a ready-to-use asset: keep product hierarchy or merge objects, tessellation presets, LODs, UV creation, up-axis switch…
2. ENHANCE YOUR ASSET WITH THE OPTIMIZATION TOOLBOX
Using the ToolBox you can perform multiple operations on selected GameObjects. You can decimate and merge meshes, flip normals, create UVs, change the origin, switch materials, create light proxy assets and more.
Even better, you’re not limited to the predefined modifiers! Using the Create New Custom Action menu, you can create your own ToolBox actions using #C scripting. Using this powerful new option, you can extend the PixyzPlugin to meet your specific workflow needs.
3. AUTOMATE YOUR PROCESS
Interactive model operations are great, but sometimes it makes sense to automate tasks to achieve greater consistency and efficiency. That’s where the new Rule Engine in Pixyz comes into play. The Rule Engine provides a way to construct a series of sequential operations to be applied to imported models, or if you prefer, to all GameObjects in a scene.
The Rule Engine contains filtering logic that allows you to restrict operations to portions of the model which meets specific criteria, such as the property name and values.
Note that metadata from the source model is available only when the option to preserve product hierarchy is selected.
Unlock your 3D data for real-time development
A Unity partner, PiXYZ provides best-in-class solutions to easily import and optimize large 3D CAD, point cloud and mesh models for creating real-time experiences in Unity. Unity customers across a range of industries use PiXYZ to prepare data from virtually any widely used design tool or file format for real-time development.
Automate and optimize your data pipeline
These PiXYZ products ensure your 3D data is optimized for Unity regardless of the source. Going from import to real-time publishing has never been so easy.