Registered users of AstroGrav 3 are entitled to download and use early access versions of AstroGrav when they are available. These give you the opportunity to try out and comment on new features before they are finalized and released to the general public, and your feedback can help identify bugs and influence the final form that new features take.
AstroGrav Early Access Software License Agreement
Early access versions of AstroGrav are only available to registered users of AstroGrav 3, and you must install them on a computer that already has a registered copy of AstroGrav 3.x.x (any version) installed on it.
The choice of object types has been expanded with the addition of a Black Hole type, together with four subtypes. Unlike other object types where the mass and radius of the object are independent, the mass and radius of black hole objects are linked by the formula for calculating the Schwarzschild radius from the mass. If you edit either the mass or the radius of a black hole object, the other quantity will automatically be calculated using this formula. As a consequence of the relationship between the mass and radius of black hole objects, it is the sum of the radii rather than sum of the volumes that is conserved when two black hole objects collide and combine.
Sorting has been greatly speeded up when using extremely large tables, such as the ones that occur when using the JPL Asteroids imports in the Edit / Import Objects... command.
A bug has been fixed that made it impossible to distinguish between selected and deselected tools when using the View / Customize Tool Bar... command on a Mac.
The default mass threshold of a new simulation has been changed from 1.0e20 kilograms to 0.0 kilograms, so that the gravitational influence of all objects are taken into account during evolution.
AstroGrav 3.8 Early Access 02 was uploaded on 14th March 2019, and has the following improvements and bug fixes in addition to those in earlier versions.
You can now print the contents of any window with the new File / Print... command, which allows you to print to either a printer or a document on disk. The new File / Page Setup... command allows you specify the size and orientation of printouts using a standard page setup dialog.
If you want to print the contents of a view window to a printer, you might want to save printer ink by first using the View / Show / Inverted command to make the background of the image white instead of black.
In earlier versions of AstroGrav, trajectories and histories in view windows were limited to 50 time steps. There is now a new View / Trajectory Size... command that allows you to change this figure for any particular view window if you wish.