lsid wrote:
thanks for your response which helps alot....so here is the new additions to the existing house. I have been tweaking with the camera setting for awhile and this is what i came out with.
1. at the back , the roof is tilted up and i can't bring it align with the photo roof.
2. can i have the photorender image in transparency?
3. how can i bring the image(photo) to the centre?
Some comments before your questions. Align View will only work "perfectly" with a non-distorted image. Lens distortion is the greatest with wide-angle lenses. If the lens is mapping photons 1 to 1 onto the film or digital sensor, the distortion is the least (and almost undetectable with good lenses). The wider the angle, the greater the distortion ... to the point where lines will start to bend into curves if you draw a straight line against them.
You cannot align computer generated (perfect) geometry with such a distorted image without special software that similarly distorts the computer image. Attempting to 'straighten' the image in Photoshop can help for minor distortion, but you will lose proper scale ... so going the PS route requires that you tweak the partially-aligned geometry in another PS layer until you get things to merge.
Now, having said all that, one can do better than is shown in your image. You can tell that the AC camera is too far to the right of your model.
(1) What did you use for your align-view geometry? It is best to use large elements. If you can see the ground (you clipped it for us), then you could measure from the ground, or the lower shingle course, to the last visible shingle course on the two corners of the building that we see.
If you have Artlantis, it is easy to align there (not using their align tool - it has the same limitations of the AC tool) by dynamically moving the camera since Artlantis shows the background and the model at the same time. Or, set your AC OpenGL window to use the desired background image.
Alternatively, if you have Photoshop, and don't care if the image is absolutely perfect, then manually tweak your camera in AC to get a little closer than you have (don't worry about it not being aligned on top of the background image ... just get the perspectives to match), and then bring the model into PS as a layer on top of the background image and use the PS distort commands to tweak your new roof and dormers to fit over the old one. Very fast thing to do.
(2) If you mean to have your model be semi-transparent to see the image below to help with alignment ... no, not in AC ... have to do that in PS or Artlantis.
(3) If you are not doing an align-view, you can move the background image (and scale it) in the 3D rendering options. I suspect you want to simply do some post-processing in Photoshop.
Since you're in Vancouver, you might want to phone Dwight and set up a couple of hours of tutoring with him?
HTH,
Karl
One of the forum moderators
AC 27 USA and earlier • macOS Ventura 13.6.2, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB