README.md


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34

# mirror-ball

To use a latitude longitude map when lighting a sphere in the environment, the
reflection vector at every point on the sphere is used to get it's colour. As a
simplification, the sphere is assumed to be a perfect mirror, so that one
reflection vector is enough to get the right colour.

The latitude longitude map was created by taking a photo of a mirror ball and
mapping the spherical coordinates to a rectangle.

![latlong map](/data/urbanEM_latlong.png)

## Building and run

To compile and run, one has to first download
[stack](https://docs.haskellstack.org/en/stable/README/)

The simplest way to do this is by executing the following command:

```
curl -sSL https://get.haskellstack.org/ | sh
```

Then run setup in this directory:

```
stack setup
```

Finally the executable can be built and run using the following:

```
stack build --exec mirror-ball
```