There are several options for creating architecture renderings or CAD (Computer-Aided Design) drawings. One option is to use specialized software such as AutoCAD, SketchUp, or Revit, which are commonly used in the architecture and design industry. These software programs allow for the creation of detailed 2D and 3D renderings, as well as the ability to make precise measurements and design modifications. Another option is to hire a professional rendering service or CAD designer who can create high-quality renderings or drawings based on your specifications. Additionally, there are online platforms and apps that offer simplified CAD tools for creating basic designs and renderings. **

A PC with a powerful processor (such as an Intel Core i7 or AMD Ryzen 7), plenty of RAM (16GB or more), and a dedicated graphics card (such as an NVIDIA GeForce RTX or AMD Radeon Pro) is recommended for studying architecture and CAD. Additionally, a large and high-resolution display, ample storage (such as a solid-state drive), and a reliable internet connection are important for handling large design files and accessing online resources. It's also beneficial to have a PC that can support virtual reality (VR) technology for immersive design experiences. **

I recommend a laptop with a powerful processor, such as an Intel Core i7 or AMD Ryzen 7, to handle the demanding tasks of CAD software. It should also have a dedicated graphics card, such as an NVIDIA GeForce or AMD Radeon, with at least 4GB of VRAM for smooth rendering and 3D modeling. Additionally, a minimum of 16GB of RAM and a fast SSD storage will ensure quick loading times and smooth multitasking. Some good options to consider are the Dell XPS 15, HP ZBook Studio, or the Lenovo ThinkPad P1. **

One popular free, non-demo 3D CAD program is FreeCAD. It is an open-source parametric 3D modeler that allows users to design real-life objects of any size. FreeCAD supports a wide range of file formats and is suitable for both beginners and advanced users. It offers a variety of tools for creating complex 3D designs and is constantly being updated and improved by its community of developers. **

One free, non-demo 3D CAD program that you can consider is FreeCAD. It is an open-source parametric 3D CAD modeler that is suitable for designing real-life objects of any size. FreeCAD offers a wide range of features, including a modular architecture, a sketcher with constraint-solver, and the ability to create 2D drawings. It is compatible with Windows, Mac, and Linux operating systems. **

As an AI, I don't have personal experience, but I have been trained on a wide range of architectural concepts and principles, including 3D architecture. I can provide information and assistance on 3D architectural design, modeling, and visualization based on the knowledge I have been trained on. If you have specific questions or need guidance on 3D architecture, feel free to ask and I'll do my best to help. **

You can find a free 3D CAD software for wood constructions by searching online for open-source CAD programs such as FreeCAD or LibreCAD. These programs offer a range of tools and features for creating 3D models and designs specifically for wood constructions. Additionally, some websites may offer free trials or limited versions of paid CAD software that can be used for wood construction projects. It's important to research and compare different options to find the best fit for your specific needs. **

You can redeem the license key for the 3D CAD Pytha program on the official website of Pytha. After purchasing the program, you will receive a license key that can be entered on the website to activate and download the software. Once you have redeemed the license key, you will be able to access and use the 3D CAD Pytha program on your computer. **