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ALGORITHMIC SKETCHBOOOK ALYSSA MAREE SANTOMARTINO (585168) ABPL30048: STUDIO AIR

SEMESTER 1, 2014 UNIVERSITY OF MELBOURNE

TUTORS: Haslett Grounds and Brad Elias Studio #11


CONTENTS

LOFTING CURVES IN GRASSHOPPER

UNDERSTANDING GEOMETRY, TRANSFORMATIONS AND INTERSECTIONS

A.1 A.2

4-5 6-8

3


A.1 :

LOFTING CURVES IN GRASSHOPPER Learning to use the programs Rhino and Grasshopper in conjunction was the main agenda of this week’s exercise. In doing so we were instructed to create a set of curves, lofting them first through rhino and then through grasshopper. From this the importance of grasshopper was seen.

The curves of the shape were drawn in rhino and then referenced in Grasshopper. By doing so a loft which could be manipulated was constructed. The top image displays the manipulation of the first loft to the last. After each manipulation the result was ‘baked’ from grasshopper into Rhino. The grasshopper base is the red shaded object in the bottom left image. Here we can see the working process of manipulation. The left screen-grab shows the ‘bake’ having just been performed. The red curves can be seen underneath. The shape has been derived from these curves which are red as they are connected to grasshopper.

The bottom right screen-grab shows the initial lofted curve I made through the Rhino ‘loft’ command. Whilst this may be a faster method originally, manipulation is not able to be completed with ease. Instead of the loft moving with the curves as the control points are moves, as it does in Grasshopper, the loft remains stationary, only the curves themselves moving.

4


At the suggestion of the video, I tried to find an output which I could input by surface into. I tried to create a panelling system with a square, which I made on grasshopper. It became a little too complex and I was unable to make panels on my lofted shape. Within a box I experimented in creating 3D cells. They were then taken out from the box and randomly deleted to play with different forms. This was done with the Voroni3D command which created the cells around a selection of points I created within the box. I proceeded to use a similar concept on a lofted form which I had created. This time using the Octree command, I placed points on my surface and boxes were created on it. This can be seen in the screen grab below.

5


A.2 :

UNDERSTANDING GEOMETRY, TRANSFORMATIONS AND INTERSECTIONS

This week’s tutorial video’s introduced us to creating surfaces from vectors and points and then meshing these surfaces.

This screengrab shows how to add together two different vectors to create one. Two different ways of doing this was explored in Grasshopper. While they achieve the same result, one uses less plug-ins.

This second screengrab indicates how I came to create a rectangle from a plane in grasshopper. This allowed me to have a fully static and changeable rectangle to work with.

In the last technical video, I used the technique of creating surfaces on grasshopper, between points in rhino, to make a 3 dimensional hexagon. I then baked this out.

By linking in a lofted surface to Grasshopper, and using the Mesh Brep command, I was able to create a paneled surface for my loft and also my 3D box. After baking this out I could potentially lay this out and have it laser cut, just like we did for virtual environments.

6


The other video’s introduced transforming curves into other objects. I was able to create this arched surface, which I then baked out to use in Rhino, from two curves.

I learnt how to create a plane on an individual curve, and then create a shape within that plane which can move along the curve. This could allow me to create multiple ribs around a curve, allowing me to create a specific path for the ribs to follow.

I explored, through creating a set of closed oval curves, creating frames through the offset plugin. This was an interesting concept which could help me in creating a sculptural design for my project

One of the video’s had us creating a shape which we would contour under. This allowed us to form panels which could potentially be laser cut. We were also taught how to use grasshopper to lay the panels out. Even though I copied exactly what the video said, I was not able to make the panels. All of the panels were pasted on top of one another, even though I tried to separate them. I was not successful with using the orient command.

7


I also had issues with using the planar command to create a flat plane at the center of an object. For some reason my planes were massive in comparison to the ones in the video. I could not avaerage them out to find the central point. I was interested in learning about notching from creating a circle on a plane between two surfaces. This would be extremely helpful for manufacturing purposes.

offsetting the angle

Creating different parts to the circle

Creating a notch for the material to fit into. Obviously the notch has been exaggerated here

Ofsetting the line

Conturing a surface

By creating a Brep component out of subtracting different extruded shapes from my square (the Boolean subtract command in Rhino) I was able to use what I learnt in the driftwood 8

The contouring was placed against an offsetted surface to create contour lines.


Algorithmic sketchbook wk2