Lesson 12: CAD assemblies with OpenCascade

👀👇 In this lesson, we discuss how to represent CAD assemblies using Hierarchical Assembly Graphs. To materialize the concept, we use OpenCascade XDE/OCAF framework. We explain the difference between parts, components, instances, prototypes, and subassemblies. We also look over the C++ exercise code that aims at visualizing assemblies using OpenCascade AIS Connected Interactive architecture.

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#opencascade #assemblies #xde #cad #occt #programming #3D #modeling #cascade

✊ C O M M U N I T Y

📚 R E A D

🔗 L I N K S · T O O L S

⏰ T I M E S T A M P S

0:00 The basic principles of CAD assemblies design. The hierarchical assembly graph (HAG).
8:45 How to address a single entity in a HAG.
10:05 OpenCascade XDE to store HAG with metadata as colors, layers, etc.
10:36 Learn more about HAG in our paper.
11:08 Deal with XDE in Analysis Situs.
11:43 Check a structure of assembly from STEP file in Analysis Situs.
15:53 Check the Lesson 12 code to program an assembly.
17:30 How to import STEP file with OpenCascade. STEPCAFControl_Reader class.
19:40 How to display CAD assembly with OpenCascade.
22:13 Overview XDE document structure.
24:43 How to check whether a label is an assembly node in XDE document. TDataStd_UAttribute attribute.
26:20 How to check whether a label is a reference node in XDE document. TDataStd_TreeNode attribute.
27:46 How to create a representable object for a part. XCAFPrs_AISObject class.
28:25 How to create the representable objects for the references to a part. AIS_ConnectedInteractive class.
31:11 How to apply colors from XDE document to a presentable object.

[dzxxbj]

Cool thanks a lot very helpful for understand OCCT source code!

[jonathanforget]

Great video, very informative as always.

[czgguzy]

It would be sol cool to create a video about displaying model treeView in Gtk or Qt

[bhupiistersingh]

Great tutorial. Thank you very much for the efforts. I request you to please make a video on building Opencascade for webgl(emscripten) and android. Not much info is available for this over internet.

[Falcon]

Thank you so much for your help on the last video, the dockerfile worked perfectly after a few minor tweaks! Is there any chance you could create one for this video too? BTW This video is exactly what I've been trying to do, you're a genius!!!

[Draek]

Thanks again, does the VTK visualization tooltik coming with OCCT allow to do such assembly rendering (connected shapes) or only AIS gives it out of the box ?

[frums]

Is that your handwriting with a mouse or are you using a pen? Do you have any mouse recommendations?
Very interesting video!

[mdewful]

Thanks a lot for great video and very helpful. Is there any way to find the name of the solids for example I want to find Body1 and Body2.
#41=MANIFOLD_SOLID_BREP('Body1', #97);
#42=MANIFOLD_SOLID_BREP('Body2', #98);