MAC install notes

Mac install notes

To install and run PBRT on my Mac with OS 10.4

Following the guidelines at: Linux/Mac/Unix Installation notes from the CD-ROM
Using the tips at tips for building on Mac OS X at the pbrt.org forum

Steps to setup and build PBRT

do:
```
sudo gcc_select 3.3
```
since default is 4.0
set the PBRT search path in ~/.bashrc by inserting:
```
export PBRT_SEARCHPATH=$HOME/pbrt/src/bin
export PATH=$PBRT_SEARCHPATH:$PATH
```
Use whatever pathname corresponds to where you put the PBRT files. I have to manually issue
```
source ~/.bashrc
```
everytime I log in. According to documentation I've read, the .bashrc file should be executed automatically, but it doesn't seem like it is. Maybe these commands should go in some other system file but for now I'm content to manually source it.
using FinkCommander (http://fink.sourceforge.net) , I had to
- uninstall ccache and install ccache, and
- install libtiff
you can use Preview to view the .exr files or you can use the OpenEXR viewer
- download OpenEXR viewer in VersionTracker,
- in terminal window:
```
  ranlib pbrt/src/OpenEXR/lib-osx/*.a
  
```
  again, use whatever path you've put pbrt in.
in the pbrt/src directory,
```
make
```
to build the executable after which I could render simple.pbrt and view it

Running PBRT

set up paths to get to the PBRT executable
```
source ~/.bashrc
```
cd into whatever directory has the scenes:
```
cd pbrt/scenes
```
Now render and view scenes:
```
pbrt simple.pbrt
```
Then double click on simple.exr to view it using Preview.
If the scene file does not specify an output filename, then the image will be in pbrt.exr

To run the debugger:
The standard makefile sets the debugger flag (OPT -g)

gdb pbrt
...
(gdb) break Scene::Render()
Breakpoint 1 at 0x18a98: file core/scene.cpp, line 21.
(gdb) run < simple.pbrt
...
Breakpoint 1, Scene::Render (this=0xd00a40) at core/scene.cpp:21
21              Sample *sample = new Sample(surfaceIntegrator,
(gdb) continue
...
(gdb) quit

Here's a follow-up note from Bruce Adcock about this page:

"...
In there, you note a problem with getting the environmental variables
to be read by Bash. I was able to get this to work if I put the same
lines in ~/.profile, instead of ~/.bashrc (this seems to be a Mac OS X
specific oddity of where Bash looks).

I also ended up using GCC 4.0, and the Fink version of OpenEXR, which
I detail more at

    http://talamathi.blogspot.com/2007/09/pbrt-and-mac-os-x-10410.html"

Thanks, Bruce