DISPLAYING POLYGON ANIMATIONS

MODELLING LIGHTING

• This is the first stage where the ‘object’ is started off and made

by using vertices edges and faces and this is the base of anything and acts as the wire mesh and

structure of the creation.

This is where all surfaces of the object are lit up according to the

position of the lights and how many and what type of light is being emitted and this creates

shadows and displays the creation

Viewing• Here is where the virtual camera is placed and

based on the position of the camera the 3D environment is then converted so that it has a

3D co-ordinates.

Projection• It is here that the illusion of the 3D is created on

a 2D screen using perspective projection in which in 3D the closer things appear bigger than

the more distant objects which are made smaller to create depth.

Clipping• It is here that the extra un-needed material that

is out of bounds is cut away to same space and to make it a smaller file as possible as if they are outside of the player view there is no need for

them to be generated. This is not a necessity but it helps with the overall performance of

rendering.

Viewport Transformation• In this stage the co-ordinates are given to the

post-clip vertices, these co-ordinates will relate to the next stage.

Scan conversion• In this stage, rasterization is used to determine

the end pixel values. This is where the model can be transferred to other programmes.

Texturing• Is where each particles are given colours depending on their values given from the prior

step or by the designers choice.

Viewing• This is where the final image is displayed with

the finishing coloured pixles and shown on a 2D screen but appears 3D

RENDERING

• “Rendering is the name given to the process in there dimensional graphics whereby a geometric description of an object is converted into a two dimensional image-plane representation that looks

real.”

^Tucker 2005^

Rendering is the process in which a wire framed model is given a clay like cover which color, shading and lamination is added and in turn gives the object/ creation a life like feel and image. It can be done

in many different but in order to get that shiny, realistic look it takes a very long time and so render farms are there to distribute the amount needed to render and it acts like sharing out a problem and

when they have finished it is pieced back together.

Examples of the 3 different rendering types can be seen on the next slide

Rasterization is possibly and debatably the easiest mode of rendering but still has a very good effect of making virtual reality more realistic by lighting having an effect of them real time. it is made up of lots of small triangles that depending on the camera angle will be visible or not and then it takes in factors to do with lighting and this shows by the triangles appearing different colours in comparison to their location.

• Ray Tracing is like the step up from Rasterization as it has more accurate reflections of light and shine, however for modern technology it is still very hard to process and is often the only major set back. When a light source is added, every single ray of light is followed until it reaches the perspective of the camera and so it can give accurate reflections. this means that things can be seen in objects but in a realistic way and when you change perspective you will see a different reflection

Finally, Radiosity is to me personally one of the most effective, and again it focuses on light but this time how it spreads and creates faded shadows and how light can slightly bend so to speak to create a smoother feel to the 3D world. Usually, a light map is used so that that the lights path on to a texture is illuminated and around the edges of some it will for soft shadows.