﻿ Italo Pratolongo

# Week three: Computer-Aided Design For this week's assignment we have to model a possible final project using different 2D and 3D design softwares, we must also render a model. 2D: Vector

According to the tutorial I followed, the vector graphics are based on mathematical expressions, which is why the lines and curves can be resized without losing resolution.

I decided to use the software for vectorized design: Inkscape, because it is open source you can download it from this link

First, i used the tool Draw Bezier curves and straight lines, and the option create a regular Bezier path to drow some lines

Then i used the option Create spiro path to make curves

Pick the other side

And close the drawing

I drew a small motor, i can move it using slecte tool

Also, i drw the axis between the dc motor and the propeller

And the place where the solar panel and the electronic components will be, the steering wheel and the seabin i wan to use to collect trash

First sketch result

# 2D: Raster

According to the tutorial i followed, "The term "raster" is used to describe both bitmaps and pixelmaps and indicates that these graphics are resoultion dependent. If you resize a raster graphic to a larger size, the square pixels will become apparent."

I selected a size

And compare against Vector using zoom

Now, we can see the pixels! that is the difference between raster and vector. While a graphic vector is composed of mathematical functions and has independent resolution, a raster graphic is composed of pixels and bitmaps which are visible if we get too close or the image is very large

I used the pencil tool to drew a sketch

# 3D modeling

In terms of 3D design, we have to try several softwares and select the one that we think is more comfortable, for this reason I decided to design the hull of the boat

# Autodesk Inventor Professional

First, use autodesk inventor, i select a plane and create a new sketch 2D, here using the tool spline i made a curve what will be the profile of the boat

Then create 2 parallel equidistant planes and project the geometry of the foreground

Create a new sketch in a plane perpendicular to the profile and make the next curve with the spline tool

Then, with the loft tool 1select the main axis and the profiles, creating a curved surface that will be the hull of the boat

I used the tool mirror to replicate the surface in othe opposite direction

Then i used boundary patch to close the helmet of the boat

I used the thickness tool to give surface thickness (10mm as you can see)

And changed the appearance of the solid with inventor potions

# Solidworks

I also used solidworks to compare which software is easier to use, open a new file and select the option part to build a single piece

Select a plane and start working, similar to Inventor

I used line and spline to create a sketch

I used revolve on the axis (180 degrees)

Then i used shell

And modified the appearance of the solid

Final result

# Rhinoceros

My experience using rhinoceros was not entirely satisfactory because I was not used to working with several views at the same time, I had to create curves in space and I did not orientate well, but I discovered that it is more powerful to make curved surfaces in quantity, I think with a lot of practice it would be a very good tool.

To design the boat's hull draw several curves in the space according to the shape that the boat should have and create orientation rails, then use the sweep 2 tool to create the surface, then mirror to complete the solid

I also discovered a rhinoceros addon which allows to render objects, besides this software allows to import STL and OBJ files to be able to work them, for this reason I exported my boat made in Inventor as STL and I imported it in Rhinoceros and I rendered it, because this was the design what do I like more

Final result!