Lesson2. Computer Aided Design

by Jiyoung An


Parametric Design, with different modeling software: Inkscape, Fusion360 and openSCAD.

2D Modeling with InkScape

I had a little experience with 'Illustrator'(which is pretty much like origami), but I didn't know much about 'Photoshop' since the concept was layer was kind of confusing to me. Anyway, I decided to learn Inkscape this time. There are several cool kinds of stuff that we can do using 2D modeling software. It seemed in 'Inkscape' you can do different stuff which you can only do in either 'Photoshop' or 'Illustrator'. I found lots of tutorials on youtube, like designing a pattern, logo, icons, or vectorizing the image. This time, I limited myself with making an outline of my own photo by using built-in 'trace bitmap' function. :P But I want to try more as time permits even later week :) For 2d Modeling, I also installed Gimp. With this, I could make a moving gif image using different layers. It will be also useful for further documentation. :) I think GIMP is the better solution than other online tools in creating gif images in that you get more freedom on the amount of time that you are spending on each layer of pictures and guaranteed quality of the final output.

1st drawing with inkscape. trace of my photo. Tutorial: how to trace bitmap with inkscape
How To: Bitmap Trace with Inkscape
How To: Create gif image using GIMP 2

3D Modeling with Fusion360 and OpenSCAD
3D Modeling is a thing which I've always really wanted to learn. Although I have tried some 3d modeling using Unity Game Engine or 123Design, but only to a simplistic extent. And I was not used to designing or making -even with my own hand. So I didn't know where to start. I decided on software first. Fusion360 from Autodesk was my choice as I still want something different. The software is provided free for students, and I could find lots of tutorials on it from Youtube as well. I found myself learning from youtube is very informative. Although in this week, my focus was more or less like learning the tool itself, learning tool will help me anyway later I want to design specific things. Below are useful tools when drawing in Fusion. Then I moved to Antimony, I downloaded it but I didn't know where to start and I gave up. Later our Instructor Marcel showed me how to use OpenSCAD.

Fusion360 Guide
Although with tutorials, Fusion360 was easier to learn, I had first a problem with selecting a plane to draw. So here I introduce some of the key features to 3d modeling in Fusion360.

Select Sketch Plane
Sketch On The Surface
Make Shape
Dimension
Spline
Revolve
Set Offset Plane
Split Body With The Plane
Shell
Circular Pattern

Difference of two 3d modeling software - Fusion360 vs. openSCAD
The biggest difference is a level of interfaces. While Fusion is purely about drawing from the toolset, in openSCAD, the concept of such tool is purely hidden. Due to that, thinking process that I took in using both software was quite different. In Fusion, I had to start drawing from the one face. So, drawing 3D objects mostly started from drawing 2d profile and extruding them. It is good when I wanted to start drawing an object relative to (e.g., on the face of) the other objects. But things like aligning a center of different objects are not straightforward. In openSCAD, however, I could make 3d objects appear, and align them to the center of origin, and nest same structure as many as I can with a just simple bit of a code. In conclusion, I felt that drawing a furniture can work better in Fusion 360, and drawing a patterned shaped will work better in openSCAD. Concepts of cutting and intersecting were similar in both software.

tried nested boxes in fusion360. not so intuitive
1st drawing in openSCAD. in openSCAD things like this are much more easy.

Below are results from the assignment.

1st drawing with fusion. Boxwithlid. link to Tutorial
2nd drawing with fusion. lampshade. link to Tutorial