Greetings,
I would be very grateful for any advice regarding the following.
I am referring to the projection of image A onto the viaduct form - open polysurface.
I mean the texture should be in the same position on the viaduct form as in the image below. Simply duplicate it.
I assume this is a simple task for those familiar with Rhino.
Unfortunately, I am not one of them.
Thank you in advance.
I am attaching the image below.
best would be to post a part of your geometry that people can use it trying to figure out the best approach, images only help so much in helping you.
i guess you could try ProjectToCPlane with the polysurface, duplicate the image below and use the polysurface boundary to trim the part off that you dont need, now use the flattened polysurface as a base surface and use FlowAlongSrf to bring it up to the initial one. but again i am just guessing now, if that does not work post a portion of that file, at least the polysurface and the image.
make a new material, (physically based) and in the base color channel add the image you are using on the ground plane
now select the bridge surfaces and assign that material.
now with that surface selected go to mapping and apply a planar map
now show mapping and adjust it with the mapping widgets.
see below-
then select the model, and go to mapping, assign planar mapping and snap to the corners of your picture/ ground plane
show mapping and adjust as needed with gumball-
Thank you very much for your time and, above all, for the full and complete information, truly.
I will try to apply the suggestions you have so kindly provided.
I will be sure to let you know the results.
In the meantime, I am sending you a file with the situation regarding the issue.
I have been using Sketchup, where I think a similar procedure is very simple. Hence my uncertainty about the approach in Rhino, where I am just starting out.
The image is also below.
PS
I do not know if Rhino allows a similar approach to Sketchup for projecting images/textures onto selected objects.
Based on your suggestions, it seems more complicated.
Especially, for example, in the case of projecting Google Earth textures onto a large number of buildings as roofs.
Once again, thank you and best regards.
File in question:
https://we.tl/t-zFjxE13zCc
Sketchup approach:
It does not use a similar workflow to Sketchup. Rhino’s approach to texture mapping is very technical and fiddly in a way that I don’t particularly enjoy doing, but you do eventually get used to.
There is basically no abstraction, you are directly placing and manipulating surface UVs onto a texture. In addition to the workflow shown by Kyle, getting acquainted with the UVEditor will make things easier.
wow… your image is 269 mb… does it need to be that big? that is a a LOT of overhead to be carrying around in this file…
it’s 40 inches wide at 600 dpi… that seems like madness for this model unless you plan on doing massive renders at full print quality… screen can only display 96 dpi… anything more than that is a waste for on screen stuff…
you can do this the same way I showed above-
one material, one image map, one big planar map
close up
fwiw, I changed the image map to 72 dpi in photoshop and the file dropped from 569 mb to 279…
that’s a huge difference for your machine to handle.
Thank you for the encouragement. However, I don’t know if I’ll live long enough to get close to your Rhino knowledge.
do what I did… ask a million questions on the forums…
I think John Brock and Pascal retired just so I’d quit bugging them … 
luckily I’m no where near retiring yet, so It’s my turn to pay all that back…
ask away!
Thank you very much for your advice regarding the resolution and size of the image.
Contrary to my ignorance, my equipment allows for such extravagances.
I have had unpleasant experiences with image quality degradation when moving towards the final version in D5 Render.
I will keep your advice in mind and thank you for your time.
