Tool
Change Density Of 3D Model By MeshMixer
Here is a video to show how to change the density of model by MeshMixer, then compare the new model and old model in ParaView. The general steps are in the following part.
Math
Rigid Transformation And The Block Matrix
The affine transform in the 3D world can be represented by a 4×4 matrix. If there is no scale in the affine transform, the vector is translate vector and A is the rotate matrix. The original point’s position is representing by M, the changed point’s position is M’. Read more…
Math
Cross Product, Dot Product, Tensor Product In Matrices Forms
Cross Product Let’s define vector and and their cross product . As known that , so we have: The cross product is antisymmetric due to its definition. Dot Product So we can write the dot product of two vectors as the matrix form. Read more…
Algorithm
Rotate Angle, Model’s Size In Local System, Boolean Operation, Intersection Circle
Calculate Rotate Angle And Asix Between Two Vectors, Calculate Model’s Size In Local Coordinate System, Boolean Operation For Mesh, Found Intersection Circle Of Two Models.
VTK
VTK – Scale 3D Model Along Special Direction
the action scale works in the three directions axis X, axis Y and asix Z. So the scaling transform I want to create needs to rotate by 45 degrees around asix Z, then apply scale(2, 1, 1). But the new transform will rotate cube surely. How to scale the cube without rotating or translating it?
ThreeJS
Interaction Style, BBox, Picked Point On Mesh In Three.js
Here are some basic computing tasks for mesh in three.js. Calculate The Bounding Box Of Mesh, Interaction Style, Get Picked Point.
VTK
VTK – Why Did DeepCopy Fail For vtkTransform?
I found a strange result about transform computation in my project. I create a new transform B by A, then use A to deep copy B and print it. There is a different matrix if I use shallow copy for A.Turn on the Warning Display setting for vtkTransform object. I Read more…
CGAL
CGAL: Area of Parallelogram And Volume Of Triple Vectors
We can get the third vector by cross product of two vectors, the new vector is perpendicular to the first vectors. We also know the geometry meaning of the determinant, it’s sign volumn value for three vectors.
Algorithm
Find Closest Plane Between Points In 3D By Levmar Algorithm
how to find the closest plane closest to a few random points in the 3D environment. We know that the sum of square distances from point to plane can be calculated.