Challenge 6 : Concept Modeling of Side Fender
Concept Modelling of Side Fender
INTRODUCTION
Concept modelling-
CAS modelling or concept modelling is modelling where the 3D data starts to take shape. It is a crucial part of the process as everybody involved in the design process depends on this to actually visualise, how the design has come out, the shape and feel of it, and to inculcate the design features and what and what not to update.
This process starts from the point where the design has come up to a point of finalization and ready to go ahead.
Surface-
A surface, as a term is most generally used is the outermost or uppermost layer of a physical object or space. It is the portion or the region of the object that can first be perceived by an observer using the senses of sight and touch and is the portion with which other material first interact.
Bezier and Nurbs surfaces-
ICEM surf uses Bezier math to construct patches and curves. The good thing about Bezier math is that patches are smooth and haven’t any internal continuity breaks, essential for class A quality. Bezier (NURBS) math used by Alias.
OBJECTIVE
The main objective of this project is to follow the steps or methodology for making a proper concept model of side fender of a car.
METHODOLOGY
After opening the workbench first import the blueprints of the model.
After importing the blueprint, adjust all the blueprint accordingly.
Trace the curves accordingly of the blueprint and create a good curve network for better surface.
Then using the surface tools and the curve network, create the surfaces.
DESCRIPTION
Side fender-
To build the curve network we first have to import the sketch on a new canvas plane and according to the views. To import a picture of a new canvas plane-
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Click the window view you want to load a picture file into.
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Choose file – import – canvas image. Click on tiny box icon to open the option box.
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Set layer type to image.
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Tick on always create new canvas.
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Use the file browser to pick out the image file you would like to load and click on select.
Then create layers for the canvas. Layers are like folders in which you can keep/assign your data and whenever required you can hide/unhide to access more space on the screen.
Start tracing the curves according to the visualization
In the palette in the curve option there are two types of curve we mainly use.
Ep curve- it already have a set of CVs inside the curve.
CV curve- lets you create NURBS curves.
Then there are two other tool box which is used.
Blend curve tool box- helps to form a perfect blend between the two curves.
There are numerous transform tools in the palette which is used here. The primary tools are move, rotate and scale.
While making the curve network for concept modelling stage check for the lighting and using our visualization make the curve network.
Curve based surface tools will help you produce the surface of the model. Some of tools used are
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Skin- Create a skin across multiple curves.
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Rail- Extrude profiles freely or on path curves to make sweeping surfaces.
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Square- Needs 4 side or 4 connecting curves to create a surface.
All the sharp edges should be removed and to do that surface fillet tool is used which fillets that sharp corners. Then trim the extra surfaces.
Trimming is also done in alias. Numerous CAD frame works after a surface. In Alias there is a middle step required for trimming, the formation of ‘curve on surface’.
Tools for curve on surface (COS)- Project, Intersect.
Project tool will project the curves on to a surface.
Then using the trim tool we remove the extra surfaces.
Interactive shading-
Interactive shading uses system’s graphic to draw surfaces. There are 2 form of interactive shading. Hardware shade and diagnostic shade either can be used to help visualize the model. However, each provides totally different practically.
CONCLUSION
With the help of this project, we got to learn about surfacing the model and also about concept modelling with the help of Alias and got to learn about the surface tools.