How to drape an image over terrain/ a site model?

[unearthed]

How do I drape an image over terrain/ a site model? My image is a jpg with a pencil concept

 

The image in the space is a texture in a rectangle I'm using as a visual guide at the size, orientation and position that I want the surface to be at.

 

My site model is built from 3D polygons contours.

Red poly is my referance object to orint image position

 

I've tried the texture mapping route but get repeated crashes when I try and chhange the I and J dimensions - or the image size reverts just after it display at a larget size. 

 

I don't do a lot of 3D in VW and there seem to be a lot of possible ways to do this and a lot of ways that are a waste of time. So has anyone got a workflow that has a useful outcome?

 

For the purposes of this I've centred my drawing on the origin.

[Jeff Prince]

You need to make the texture the same size as your site model and it will line up nicely on its own.

If you send me the sketch and the site model, I can show you how.  Basically, you will leave the areas beyond the sketch transparent and make the pixel dimensions in the same ratio as your site.

[unearthed]

Thanks for your kind offer Jeff - I used sketchup (which also drapes better if image slightly > than model). But I will come back with the skect and the model for you as I want to learn to do this in VW.