Help with rendering

[anders_karlsson1]

Hi

I try to achive a nice rendered picture of a aluminium profile cut out (see picture). And i need to have it with transparent background.
But if i render it just with lights its very hard to get it to look good, because the lights are not bouncing at something. If i make a backdrop the product looks better but i dont want the backdrop to show in the png file.. Can i make it transparent but still affect the environment,.?

[konstantin_chaos]

Hi,

You can do the following (Option 1):

1. Navigate to the Environment settings
2. Remove the Background texture and leave the color black
3. Add a spherical HDR image to the Reflection, GI and Refraction slots (as an instance)
4. Render

If you save the image now the background is going to be transparent.

Option 2:

1. Remove all environment textures (use black color)
2. Create a Dome light
3. Add the spherical environment image in the dome
4. In the Dome Options make the Dome Invisible
5. Render

Both options are similar.
However with option 2 you'll get direct light emission from the Dome instead of relying on pure GI for the indirect lighting.
Option 2 is better for objects using mostly diffuse materials.
If you're mostly dealing with metallic reflections both options are identical.

Hope that helps,
Konstantin

[kenancakir]

As a note, "affect alpha" option in dome light settings should be uncheck as i know, to get png output..

[konstantin_chaos]

As a note, "affect alpha" option in dome light settings should be uncheck as i know, to get png output..

Correct. kenancakir thank you for the remark.