Background reflexion on reflective materials

Hi, its been a while since my last post but I came upon a new issue.

I have a background image that I was using for a while now but since we now do windows with a reflective material, whe usual background image used as flat background doesn't reflect on the front on the reflection.

I tried cylindrical and sphere but it scraps the background image as it strech it.

On the attached image, we have the grass on 1st floor, water on the 2nd floor windows but on 3rd and 4th floor, where the sky should be, there is nothing, just the plain sketchup gray color.

Thanks for the fast reply.

[Edit - added image directly to post - using icons above the edit area - Al Hart]

Attachments:

window issue.png, 2 MB

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Permalink Reply by Simon Loisel-Goudreau on June 7, 2011 at 1:14pm

Sorry just found out i'm too late for editing.

The magic wand I was talking about is from photoshop.

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Permalink Reply by Richcat on June 7, 2011 at 3:54pm

Sorry coming to this bit late by the sounds of it

But I believe background images can be rendered on reflective surfaces.

NB this only works with Packet Mode not Path Trace

You use the background tab- select visible and reflected, browse for image to use.

Start render, let it run a pass or 2 stop it and select blue render plus logo top left had corner, then select Support and then deselected "Manual Process Background images"- and re start render- only then will background image be reflected, in windows etc accept if you use just a straight HDRI sky.
For this render I just used automatic sky, with a bit of sun.

You can use the button "Convert image to HDRI background", if you want your chosen jpeg image to provide some lighting colour to the scene, but this only works as planar. Here I converted the sunset to hdri then selected it under the normal hdri sky tab and made sure sky was on when rendering, as well as image used as background

You are also able to get an extra lighting channel to control the hdri, but that only works with Path Trace so no refective background image accept HDRI sky
which will need to high res or gets very pixellated.