LIGHT

The course of Visual Communication is finishing. We had the last lecture of the subject which was focused on the light and its effects on pictures, animation and videos.

Materials can be designed at computer by two types of models:

1) Local model: used in graphic arts to build real time images. Each color of the parts of the image must be defined. Light is defined by 3 elements: ambient light, diffuse reflection and specular reflection.

2) Global model: it looks more real as it contains shadows, reflects or transparencies. Those are defined by different types of algorithms. An important characteristic of this model is the ‘ray tracing’, what means that rays reflect a defined number of times in the different objects of the model.

We can observe the shadows on the floor.

There is a reflection on the table.

Transparencies both in windows and in the water.

Regarding colors, it’s not the same for emitting light or for filtering it. Filtering the main colors are red, blue and yellow; while emitting they are red, green and blue.




Thanks for all the course, which has had really interesting ideas and concepts of designing, even web pages, presentations, videos or virtual models.
Hope to see you soon!

MODELLING

When we think about modelling, the first thing it comes to me is a picture formed by small polygons, but what is it?

( http://www.turbosquid.com/3d-models/characters-disney-pixar-cars-3d-model/613988 )

That is a type of modelling, yes it is, but modelling is not only that. Is to render a real or only existing in computer prototype, so that we could change the initial status to another new one to create a movement. We first make a data structure to render the object, then create the object on the computer to afterwards have the opportunity to edit it.

This process can be made by different methods but the most popular is the named previously: polygonal representation. Polygons, which are defined in a certain position, define the shape of the object and they can be textured. Not only that, we can move them coordinately so that it seems to be moving. However, it requires a lot of information about the positioning , the shape and the texture of each polygon.

To sum up, I should say that this is a really complex technique to model your object, the goal you have formed in a computer for applying any change after.

Picture made in ProEngineer 5.0 (self made picture)