Cams & Spark plug

The shape of the cam is very basic

For this I decided to use a cylinder and cut away the unnecessary parts. The problem I found was that it left gaps between vertices.


The solution was to use poly mode and draw in polys so that the entire model was connected together.



The shape of this model is quite rough, but due to the cams not being in direct view of the camera the detail did not have to be high.

The spark plug was a much harder shape to model. I decided to use a box modelling technique to produce this.

By using information found on the internet I was able to setup a reference plane to guide for me to follow.



To start with I had a cylinder split into multiple height sections. Using both the movement tool as well as the scaling tools I was able to adjust the edges and manouvre the vertices into position. The scale tool was beneficial as it allowed me to move the outside edges and keep the rounded shape.



The group agreed that the sparkplug would be used towards the animation. Here Rob was able to teach me how to use the slice modifier, using a simple technique he taught me that it could be used to display work in an interesting way within animation.

Group Meeting 4

The first week of modelling the engine has been completed. The group have encountered a number of problems while fitting the individual models together. The scaling of the models are wrong. Even though the dimensions of each piece are correct they need to be adjusted slightly to fit each piece correctly.

This is largely down to the poor views of the reference photos, and shows how important it is to have sufficient material to work from.





Due to the poor quality, I decided to research the styles of Pistons and find one that matched the style within our 2 stroke engine.




This picture was perfect for detailing what parts of the engine may look like. For me I had to use a similar style Piston and crank shaft. I did not go into full detail on the crank shaft purely as the base and top wouldn't be seen for detail to be noticed.

While building the engine it was noticed that we had not created all parts to the engine. This included the cams of the crank shaft


The Compression chamber for which the Piston would move within as well as a spark plug.

These would all be vital in producing a successful representation of how a 2 stroke engine works.

Kiel was delegated the modelling of the chamber while I was given the task of producing the cams. I also put myself forward for producing the sparkplug. I felt that I couldn't really show what I have learnt while using 3DS and the sparkplug would be a challenge.

Piston Part 3

The final stage of the piston was to to produce the bolts. I decided as these were not a set model for the group that I would produce a basic shape. I did want to produce a model that resembled a screw thread on it, but after alot of thinking I decided against it as I couldnt find a suitable way of producing such a model.

The main bolt was produced by extruding the centre of a cylinder twice. Even though the thread is now ridged, we can add a smoothing material at a later stage to produce a better effect.



The 2nd bolt used the same technique but instead pushed the centre of the bolt inwards.

Piston Part 2

following the succesful modelling of the Piston head, it was now time to produce the crank shaft, and the connecting bolts.

The chances of seeing the bolts during the animation is slim, but by producing them it gives the group alternative directions to go with the animation.

The crank shaft uses a simple shape. For this I decided to produce the outline of the shaft using the line tool.



Then use the Extrude modifier to produce the 3 dimensional shape.



The problem with the extrude tool (as stated earlier) is that the object will be ridged. As I need a smooth object for the crank shaft I decided to use the cut tool (Poly) within editable poly to produce more edges to allow me to easily manipulate the edges into a smooth shape.



I added detail by extruding a section of the shaft (centre). Using a cylinder I was then able to use the boolean to bore the mounts for the bolts to fit.

Piston

When the work was delegated it was agreed that any modelling should use minimal polygons. Rob had made us aware that once animation was added as well as textures to any models, the render times would increase substantially.

My task was to create the Piston. I started with a cylinder and set the dimensions based upon the scale agreed during the groups previous meeting.

I then split the cylinder into multiple sections, this was to enable me to match up all indentations from the head of the piston.

By setting the cylinder to an editable poly it allowed me to manipluate specfic points of the model.

My first thought was to extrude the indentations on the piston. The problem with this is the surface becomes ridged and would mean I would lose the initial smooth texture.



My next idea was to move the points manually, this would allow for detail to be kept but the problem would be the time taken to keep the symmetry all the way round the piston.

The third option was to select an edge and use the Loop function to make sure the same set of edges round the cylinder were selected and use the scale tool to draw areas in and keep the smoothness of the object.



To keep the squareness of the indentations of the piston head I used the movement tool on the selected edges to model them into place.



The next stage was to bore the centre of the piston head. My initial idea was to delete the vertices individually. A problem I found with doing this was it offered no depth within the piston.



I realised that the best way to produce the depth within the base of the Piston as well as save time was to use the boolean modifier which allows a model to be subtracted from another.

This technique was also used on the face of the piston where the bolts mount to.

Work Delegation

The group have decided to split up each task into smaller chunks where possible. The advantage of managing the work like this is that it allows each member to prove the quality of the modelling standards and animation standards which will could be a good way for each of us to learn new techniques through feedback off group members.

A rough storyboard has been created (see Group Meeting 3) but at a later stage a higher standard copy will be produced.

After group meeting 3 I was given the task of producing a voice over to give the group an outline of what should be done with the models during animation.

The modelling tasks have also been delegated.

Elaine - Carburetor

Kiel - Master cylinder

Robert - Magnetic flywheel & bottom end of cylinder

I have been given the task of producing the Piston and Crank Shaft.

Group Meeting 3

Following on from previous group discussions, we decided to concentrate on producing ideas on what we believe is most important to create for this video.

We decided that the video should be short, this is because we do not want the viewers becoming bored of what they are watching. For this reason, we have decided that the video should be to the point and run for no longer than 2 minutes.

From research that we have gathered, many videos based on the 2 stroke engine are covered within a similar time scale.



Within this time, it will also enable the group to explain and get the knowledge across to the viewer in reasonable depth.

The group have also discussed how to enhance the viewers experience. This included:

Use of visual effects - to produce a more appealing element to the video, if the video is dull then this will come across in the viewers attitude towards the video.

Use of speech - Having a video with sound effects would be simple, but then the viewer would find it very hard to follow what is taking place and going away feeling they have gained information. For this the group believe it is important to use audio commentary as well as visual elements to make the experience as understandable as possible.

The group have decided to concentrate on the side of the engine, this is because it will represent in greater detail the information being explained within the audio. It will also limit the chances of mistakes being made with the visual elements of the video.

Another visual element discussed by the group was the use of tags and arrows so that the viewer knows what area of the engine to concentrate on as the audio goes through its cycle.