OSArch Community

Blender Kernel

1. R by ReD_CoDE on 25 Sep 2020, edited 7 Oct 2020 #

   Topics related to Blender Kernel/Engine

   • Geometric Modeling Kernel

   • Graphics Engine

   • Physics Engine

   • Game Engine

2. R by ReD_CoDE on 25 Sep 2020, edited 25 Sep 2020 #

   https://github.com/blender/blender/search?q=quaternion

   https://github.com/blender/blender/search?q=nurb

   https://github.com/blender/blender/search?q=nurbs

   https://github.com/blender/blender/search?q=spline

   https://github.com/blender/blender/search?q=bspline

   https://github.com/blender/blender/search?q=bezier

   https://github.com/blender/blender/search?q=curve

   https://github.com/blender/blender/search?q=knot

   https://github.com/blender/blender/search?q=subd

   https://github.com/blender/blender/search?q=subdiv

   https://github.com/blender/blender/search?q=cube

   https://github.com/blender/blender/search?q=cuboid

   https://github.com/blender/blender/search?q=pyramid

   https://github.com/blender/blender/search?q=prism

   https://github.com/blender/blender/search?q=polyhedron

   https://github.com/blender/blender/search?q=cylinder

   https://github.com/blender/blender/search?q=cone

   https://github.com/blender/blender/search?q=truncated+cone

   https://github.com/blender/blender/search?q=ball

   https://github.com/blender/blender/search?q=sphere

   https://github.com/blender/blender/search?q=csg

   https://github.com/blender/blender/search?q=sweep

   https://github.com/blender/blender/search?q=profile

   https://github.com/blender/blender/search?q=extrude

   https://github.com/blender/blender/search?q=isocurve

   https://github.com/blender/blender/search?q=isosurface

   https://github.com/blender/blender/search?q=polynomial

   https://github.com/blender/blender/search?q=brep

   https://github.com/blender/blender/search?q=frep

   https://github.com/blender/blender/search?q=voxel

   https://github.com/blender/blender/search?q=volumetric

3. R by ReD_CoDE on 2 Oct 2020 #

   @stephen_l @Andyrexic could you please list all the obstacles related to Blender's geometry kernel? Solids, B-Splines (R2 --> R3, R3 --> R2), and NURBS?

   It seems that Blender somewhat supports NURBS and B-Splines, but does it convert them to meshes?

   https://docs.blender.org/manual/en/latest/modeling/surfaces/introduction.html

4. S by stephen_l on 2 Oct 2020 #

   2-5 billion $ i guess.

   Nurbs / B-splines display always is a mesh / curve evaluation.

5. R by ReD_CoDE on 2 Oct 2020 #

   Maybe because OpenGL and other libraries dropped them after v3.0 and didn't support, however, still other possibilities

   It seems that we should build a "tiny" FreeCAD :)

6. A by ar_lav on 3 Oct 2020 #

   If I remember correctly Blender does not support solids by design. The mesh modelling approach was developed as a fast method to allow artists maximum flexibility with animation. I ll try and find an earlier text by Ton explaining this.

7. R by ReD_CoDE on 3 Oct 2020 #

   @stephen_l B-Splines and NURBS are mathematical equations in this way:

   • Volume: V(u, v, w)

   • Surface: S(u, v)

   • Curve: C(u)

   So, does Blender save and let us import and export them in those ways (parametrically)?

   And for sure for representation, it evaluates them to meshes through tessellation or voxelization or other techniques

8. S by stephen_l on 3 Oct 2020 # +1 votes

   Yes blender does save nurbs in parametric way, but the current lib behind nurbs is quite limited, and not talking about missing required basic operators toolset.

   So in order to get anything usefull, it probably will be way easyer to implement eevee/cycles into a nurbs / volume capable piece of software.

9. P by pixelpartner on 4 Oct 2020 #

   Blender uses the open source library OpenSubdivision started by Pixar. Besides of traditional poly meshes, this lib also supports SubD surface descriptions. I point this out, because surfaces described this way are much more efficient in storage, rendering and modern GPUs are / will be capable of real time presenting them.

   But for now most workflows in Blender tend to convert all intermediate results to traditional polyMeshes of various tesselation levels.

   I'm curious as well about the post of Ton, you mentioned.

10. R by ReD_CoDE on 4 Oct 2020 #

    @pixelpartner it seems that until Blender 2.92 they will improve their mesh system and include Vulkan, ...

    Mesh is mesh, it's great for many usages, but not always, especially when it comes to volumetric data

11. R by ReD_CoDE on 7 Oct 2020 #

    IFC NURBS samples: https://github.com/buildingSMART/Sample-Test-Files/tree/master/IFC%204.0/NURBS

12. R by ReD_CoDE on 7 Oct 2020 #

    https://github.com/buildingSMART/NextGen-IFC/issues/75

Login or Register to reply.