Render Studio image shifting

dave_franchino

Hey folks - I'm a newby at Render studio and am strugglig to learn how drop my rendering on top of an existing image. When I "preview" the image in render studio it looks like I have the object positioned correctly - but when I go to actually render, the size of the object is changing and the image is jumping around.  Any idea what's going on?

Thanks!

Paul_Arden

Quick question, is the image a custom background image (i.e., assigned through the Background option on the view menu)?

If so we are aware of a bug with fitting the background image in the preview if the aspect differs from the output. Feel free to file a ticket if you want to be informed of the progress of that.

While a hassle, you can work around it by resizing the panels in the interface until the aspect ratio of the preview matches your target resolution (so when the dotted lines are around the very outside of the viewport).

dave_franchino

@Paul_Arden - yes, the image is a custom background - I wanted to show what a cabinet I'm designing would look like in my house so the image is from my house.  I'm not sure I exactly understand your work-around.  For what it's worth - I'm really struggling to manipulate the perspective image of the object I'm trying to render so it has the proper orientation and scale to match the background environment (I'm struggling to do this with the standard environments as well as when I use a custom background).  Are there any tutorials or instructions on how to manipulate the object view so that it "matches" the environment in scale and orientations? 

Thanks!  

martin_kopplow

This is a fine example of why we need more sensitive navigation controls in render studio, as already discussed in another thread a few days ago. As a consquence, I have asked for an improvement in this area: 

https://forum.onshape.com/discussion/24107/enable-navigation-by-space-mouse-in-render-studios 

You may want to vote that up.

What Paul says is that your background image should have the ame aspect ratio as your model window when rendering, to prevent the image from shifting. Just drag-resize your onshape browser window to match it. That's a workaround until the issue is solved.

Paul_Arden

dave_franchino said:

I wanted to show what a cabinet I'm designing would look like in my house so the image is from my house.  I'm not sure I exactly understand your work-around.  For what it's worth - I'm really struggling to manipulate the perspective image of the object I'm trying to render so it has the proper orientation and scale to match the background environment (I'm struggling to do this with the standard environments as well as when I use a custom background).  Are there any tutorials or instructions on how to manipulate the object view so that it "matches" the environment in scale and orientations? 

The work-around is just so that what you see in the preview matches the output, it doesn't help with actually getting the perspective aligned. Currently matching the perspective is really manual trial and error as we don't have aided or automatic camera matching.

There are to things to consider when trying to line up the perspective, firstly, it helps if you can match the field of view of the camera that took the picture you are using as a background to the viewport. On the viewcube menu you have an option for the field of view allowing you to adjust this. For most cameras or phone cameras you can find the field of view values with some Googling for the model or in the metadata. Having this right will make it easier to line things up. You can try and eye ball or guess as well but it's definitely easier if you know.

After that it's really as I say more of a trial and error process unfortunately. I find with the field of view set close to the cameras you can usually get something reasonable. In the future we may add something to help match the perspective (e.g., by drawing vanishing lines) but a general solution for this is fairly complex.

If not using a background and using an environment instead then if you don't want the scene to shift over the background then "Hemisphere" environment option on the environment panel on the right helps with this and basically locks the scene own to the environment. For that you may need to play with the tripod height and environment radius to get a good match and some environments work better than others for this.

dave_franchino

thanks @Paul_Arden - took me a bit but I finally figured out what you meant by "size the image to match the aspect ratio of the rendering.  Not elegant but does the trick. Thanks!

Dave