Parametric vs Non-Parametric Modelling, where it should be used…
The most used ways of modelling are Parametric and Non-Parametric Modelling. Each one has its own advantages and disadvantages. The Parametric modelling have constraints and dimensions wherein Non Parametric modelling you will able to play with your creativity.
The workflow for parametric modelling is different from non-parametric modelling. In Parametric modelling, you will be starting with a 2D draft and then you have to check the possibility of manufacturing it, and then the design process starts. But in the non-parametric modelling, a concept is required the possibility of manufacturing or producing it is not taken into account. To be short anything that involves engineering comes under parametric design and anything that is used to represent its look comes under non-parametric design.
Comparing the mesh count in both of them, the parametric model has high mesh count and the non parametric has low mesh count.
Non-Parametric Modelling
Let’s talk about the workflow of non-parametric modelling. It all starts with a concept.
- First, a concept has to be fixed for example: giving life to vegetables or plants. The sketching process may or may not be used in this process. the concept will then be built into a model.
- Then the process of sculpting takes place to give it a good shape.
- After this, the retopology is checked only if the retopology is correct the animation works perfectly and the texturing can be done perfectly.
- The next process is UV unwrapping. The UV unwrapping can be done in most of the modelling software. If the UV is unwrapped perfectly there will be almost no difficulty in applying the texture.
- After the textures are applied the model starts looking like a real one. If the model that is created should be animated it should go through a process called rigging where the bones or joints for the model is defined which decides the type of movement for the parts.
- After this grooming is done where the hair, eyelashes and body hair for the model is created. Here comes the most important part which is the lightning which gives a realistic feel for the model.
Only if the lights are placed perfectly the model looks like a real one.
- Next part is the compositing where the camera effects and some colour adjustments can made to enhance the look of the model. depends on the usage of the model it could be rendered or not.
The rendering is the process of taking image output of the product there are a lot of software’s that are used only for rendering . some of them are Octane, RedShift, v-ray, etc.. and some come along with the 3D modelling software Blender Render, Evee comes with the blender software and Arnold comes with the Maya software.
From my point of view this type of modelling can use for product advertisement, game objects, Augmented reality, Virtual reality these are the places where the loading time should be less.
As the no of meshes in non-parametric modelling is less it takes less time to load the object.
Parametric Modeling
In the parametric modelling, the workflow is a bit different, First a problem is identified then the analysis of the problem is carried out. A product for solving the problem should be created. first the product is sketched. then the possibility of manufacturing and its features are checked if some changes have to be made it is made in this phase. after this the final product is sketched then a 3D model is created using parametric modelling software like Catia, Creo etc.. after this the product is analysed using analysis software like Ansys, Nx Nastran etc..
A high number of mesh count should be there for proper results. In this stage, the material that has to be used for the manufacturing of product is fixed. Then a 2D draft of the product is taken using the software and given to the manufacturer. this type of modelling is used for the mechanical or industrial field.
