HDRI

Hi,

I have HDRI in environment slot for lighting exterior scene. I would like to remove HDRI from image when rendering I want just black background…
how?

Go to Render setup>Corona Settings>Enviroment>Enviroment overrides turn Direct visibility override on and put whatever map or colour you want.

Put a checker map in enviroment override :]
If you want to replace enviroment in photoshop, make sure that your enviroment material has transparent (black) alpha channel Material>Advanced options>Alpha channel.

Both are enviromental light sources in Corona. Sun&Sky is procedural while HDRI map is capture of real life light information. Both has advantages as well as disatvantages agains each other.
Sun&Sky pros - very flexible, easy to fit to required situation. Cons - it’s very uniform, so can be quite boring, hasn’t night mode.
HDRI pros - very often contains much more interesting light, is irreplacable when there’s a need to integrate CGI into photos. Cons - most HDRIs which contains unoccluded sun, is improperly captured and needs modifications to give better results, contains fixed light information, so isn’t very flexible.

It is perfectly possible to combine procedural sun with HDRI map to complement each others drawbacks or to adjust artistic properties.

Oh c’mon man, have you tried to select sun object and to look after its properties in modify tab? It’s really very basic stuff.