1. What is a parametric model?
A parametric model refers to a mathematical or geometric model whose shape and characteristics are defined through a set of parameters. These parameters can be used to control the size, shape, scale, position, rotation, curvature and other attributes of the model, thereby enabling flexible adjustment and deformation of the model.
In the fields of computer graphics and 3D modeling, common parametric models include:
Geometric parametric model: A model that defines geometric shapes through parameters, such as spheres, cylinders, cubes, etc. For example, a sphere can be sized with a radius parameter, and a cylinder can be sized with height and radius parameters.
Curve and surface models: Models defined by parametric equations or control points of parametric curves/surfaces, such as Bezier curves, B-spline curves, NURBS surfaces, etc. These models can achieve shape deformation by adjusting parameters.
Artificial deformation model: A model that realizes shape deformation by controlling the mesh or control points, such as mesh deformation, skin deformation, etc. By adjusting the position and weight of control points, you can change the shape of the model.
Skeleton model: A model used to simulate organism or character animation, achieving shape transformation through a skeletal system and deformation weights. By adjusting the posture and weight distribution of the bones, dynamic deformation and posture control of the model can be achieved.
Fractal model: Generate self-similar models through recursive rules and parameters, such as fractal trees, fractal terrain, etc. By adjusting the parameters, fractal structures of different shapes, sizes and complexity can be generated.
Parametric models are flexible and editable, allowing real-time shape adjustments and deformations as needed. They are widely used in fields such as computer graphics, modeling software, animation and game development, providing users with a convenient and intuitive way to create and manipulate models.
2. Application of parametric models
As a 3D application scenario editor tool, the NSDT editor also has built-in parametric models. Using the characteristics of parametric models, the same model can be applied in multiple scenarios, achieving multiple uses and avoiding repeated construction . model .
Let's briefly introduce how to use the parametric model.
For this single-room, single-story house, if you need some such models in a certain scene: a three-story building with 6 such single rooms on each floor or a 4-story building with 8 such single rooms on each floor. In the absence of parameterized models, each model usually needs to be recreated.
Fortunately, parameterized models can solve this problem and avoid repeated modeling. We only need to modify a few parameters in the model. For example, in this building with 6 rooms on each floor and a total of 3 floors, we only need to modify the number of floors and rooms in the model to re-create the required data in a few seconds. The model is created, as shown in the figure:
3 floors, 6 rooms per floor
4 floors, 8 rooms per floor
Convenience, speed and flexibility are the biggest advantages of parametric models!
There are many other types of parametric models in the NSDT editor . Interested friends can check them out. If you have any ideas or opinions, please feel free to share them.
Original link: 3D twin scene construction: parametric model (mvrlink.com)