HDRI image looks too big

Replies to This Discussion

Permalink Reply by Rich Hart on September 5, 2012 at 7:44pm

In SketchUp, the FOV is set using Camera/Field of View from the SketchUp menu bar.

You then type in a number top replace what shows up in the lower corner, like 20, instead of 35, and hit Enter. Then you can zoom back a bit to get the view that you want.

Unfortunately, you have to have a very high resolution HDRi sky to be able to use it for the background that you see, if you want to have it crisp. If you set the FOV to be 20 degrees, then you only see 1/18th of the horizon of the spherical image in the background...so if the image started out as 6000 pixels wide, you'll only get about 333 pixels of that image across the width of your rendering, which will probably look a little chunky. That's why people charge more for their HDRi images which are bigger that 10,000 pixels around the horizon.

Does all that make sense?

• ▶ Reply

Permalink Reply by Rich Hart on September 5, 2012 at 7:54pm

After I wrote that, I realized that you probably want to increase the FOV, so that the model looks larger as the background gets smaller, so the resolution of the HDRi background would just get better anyway...

• ▶ Reply

Permalink Reply by Jorge Lopez on September 6, 2012 at 3:34pm

Hi Al,

Thanks for your previous info. I thought I'd share with you what is going on. I am attaching a playhouse file and the resulting jpg when using the campus hdri and setting SketchUp fov to 60 mm lense. As you can see the sky looks off. Also when I try using the bear mtn hdri, I just get a grey background (like it is zoomed up close). I noticed you have the bear mtn hdri used in your example with the jet stream camper and it looks OK. What am I missing?

• ▶ Reply

Permalink Reply by Jorge Lopez on September 6, 2012 at 3:49pm

Hi Al,

Thanks for your previous info. I thought I'd share with you what is going on. I am attaching a playhouse file and the resulting jpg when using the campus hdri and setting SketchUp fov to 60 mm lense. As you can see the sky looks off. Also when I try using the bear mtn hdri, I just get a grey background (like it is zoomed up close). I noticed you have the bear mtn hdri used in your example with the jet stream camper and it looks OK. What am I missing?

 

 

• ▶ Reply

Permalink Reply by Jorge Lopez on September 6, 2012 at 3:53pm

Hi Al,

Thanks for your previous info. I thought I'd share with you what is going on. I am attaching a playhouse file and the resulting jpg when using the campus hdri and setting SketchUp fov to 60 mm lense. As you can see the sky looks off. Also when I try using the bear mtn hdri, I just get a grey background (like it is zoomed up close). I noticed you have the bear mtn hdri used in your example with the jet stream camper and it looks OK. What am I missing?

 

• ▶ Reply

Permalink Reply by Rich Hart on September 6, 2012 at 5:16pm

Here I rendered a model with just Nancy and a box on it. Bear Mountain HDRi background.

The FOV is 35 degrees in SketchUp, but show up a little different in the rendering Statistics dialog, because I wasn't rendering to the exact same aspect ratio.

I have attached the model to this replay. Could you render it and see what you get?

• ▶ Reply

Permalink Reply by Rich Hart on September 6, 2012 at 5:17pm

Here I rendered a model with just Nancy and a box on it. Bear Mountain HDRi background.

The FOV is 35 degrees in SketchUp, but shows up differently in the rendering Statistics dialog, the real FOV can be determind by the "t" and "b" values in the line that follows: atan(.315) * 2 = 35 degrees.

I have attached the model to this reply. Could you render it and see what you get?

Attachments:

• nancy.zip, 44 KB

• ▶ Reply

▶ Reply to Discussion