Thanks for answers
Don

Thanks Selden.selden wrote:I'm not quite sure what you're asking.
Celestia v1.6 has replaced the r and R keyboard shortcuts by the "Render" menu option "Texture Resolution". (Those keys will be used for something else in a future version of Celestia.) That menu option controls which texture directory Celestia looks in first for a surface texture image file. I'f you've never changed that setting, "Medium" is selected, so that Celestia looks first in the directory textures/medres. If you select the menu item "High" Celestia instead will look first in the directory textures/hires. If it finds no appropriate texture there, it then will look in the medres directory and, if nothing's there, in the lores directory. If "Low" is selected, Celestia looks only in the lores directory. Celestia records which resolution you've selected when it exits and uses that when it is restarted later.
Celestia v1.6 comes with highres surface textures for Mercury and for several moons. When I look closely at Mercury's surface, selecting the different resolutions changes Mercury's appearance, so it is working on my Windows computer.
Does this help?