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]
Replies
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.
Link to useful info on backgrounds LINK
Sorry just found out i'm too late for editing.
The magic wand I was talking about is from photoshop.
Placing the sky as reflection on the top 2 rows seems to be the best answer for my problem at the moment.
I'm also going to try using magic wand to replace the gray surfaces with the sky jpg file.
But if you could help me up with HDRi too, that would be awesome.
You would only apply the fake reflection to the top two rows of windows.
However, if there was a tree reflected in a window, you should be able to place a sky-texture on the window and make it 50% reflective as well and you would see some of the tree as well.
None of these 'fake" solutions are great. The HDRi is the right answer.
One thing about the reflective texture is that you can see what it will look like from SketchUp.
Another "trick" to make it work, is to render the model from the other side of the wall, with the windows transparent. This rendering will show what you would see through the windows. (All of this is a lot of work - this "trick" here is a way to add reflections directly to SketchUp - by viewing the model from the other side, grabbing the images seen through the windows - reversing them and them placing them on the windows.
But I think it will be easier to add the sky reflections using a paint program if time is a problem.
Its actually too late for that, the file is already uploaded and the email sent to your mail box, i'll be cheking forums every 5-10 minutes anyway.
I was wondering, with the change the window tecture for the sky idea, is the reflection for everything else (balcony, bush, plants and flowers) will be affected?
Zip everything up. Our email program can handle 30MB attachments with no problem.
If you do have a problem, use the Upload tab at the top of this web page.
In order to get things done my tomorrow, you may want to place the reflected sky, etc. as a texture/material to the windows. (I forgot to mention that as another solution.) Or you may want to place the sky relflections after rendering with a Paint Program.
You can also send your email, or anything else to support@renderplus.com that works much better for use than the private email on the forum, and it gets saved in our email system, so it is easier to find and use.
I will send the image with the upload option since it seems a couple windows and a part of terrain are almost 20mo.
What I actually need is and HDRi of a sky and thats it, a couple clouds and i'm good to go.
If you can help me on that within the hour it would save my life and my boss too.
I'm trying to finish both renders for our presentation tomorrow and since the other one is just a top parralel view and doesn't need any skies, its the only one i have left to do.
I'm rendering at 5000x2564 on the main model and the one i'll send is just a couple blocs i've placed about where they should be. (called HDRi problems) I don't know if you can get sun settings with HDRi setting since there should be shadows on the model too?
I'll be sending you my work email through your private message box in a couple minutes so it's easier to contact me.
Thanks
We don't really recommend the fake image solution - because of the problems you have seen. And, of course, you would have to move the fake image every thime you chose a new view.
You can greatly improve the testing phase by rendering to a much smaller size (400 pixels or 600 pixels) while setting the fake image, and by rendering just the windows and image. (You can use layers for this, or there is a right click to render just the selected items - you can select the image and the windows and render just them.
HDRi skies do work. You just have to get the settings right. If you are still having problems, send your model to support@renderplus.com and we will take a look. (If you can remove everything except the building with the wandows and the HDRi settings, it will make things easier for us.)
Here is a sample HDRi rendering I just created:
If I put the image way back, its smaller and its a trial and error to find the best position to put image at, which, at 1 hours a render, I don't have the time to do that. If I make the image bigger, there is more chances that it will be in the way of the sun.
For the HDRi sky, it does work but my model turns completely black.
You could place the image way, way behind the camera, and unless the sun was shining through the image, it should not effect lighting too much. Of couse, one of the advantages of HDRi is that is can be user for illumination as well as reflection.
You have turn the sky on, (on the presets tab or on the sky tab), in order to see the HDRi background. Otherwise the HDRi is only used for lighting effect.
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