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Forums >> Revit Building >> Technical Support >> Incorrect Perpective views. Appearing out of proportion.
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Joined: Thu, Oct 25, 2007
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I am having a problem with perspective views created in 2010. The problem I have is that my building has large eaves about 1200mm, and when rendered in perspective they are being elongated and stretched to look way out of proportion to how they appear is elevation. In perspective they appear more like 2000mm. Looks like the camera is stretching at the edges. I have placed the camera relatively close to the building, but have also tried moving it right out, and then zooming in, but that has made little difference. I am not adjusting the wide lines at all. Does anyone know just how accurate the camera's are in revit, because i need the perspective and angles in this case to very accurate. Is their a way to fix this perspective distortion? Not much flexibility with the camera in revit, should I be trying to render in max? Will post some pics soon, just wondering if anyone else is seeing these problems. Note: I also saw this issue when rendering a view of a tower when standing underneath it, and the tower would appear to be flared out at the top. When if it was a true perspective it would be getting smaller.
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Ok, here is the promised images shwoing my problem. The red line shows aproximately how much these peices should overhang. So the problem is that the image is stretched / distorted horizontaly. I have placed on the image a copy of the elevation showing what the true proportions should look like. Thanks in advance to anyone who helps me on this problem.
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The camera in Revit is the equivelant of a 35mm lens I believe. When the camera is placed, and you then look at the perspective view, this should be an accurate perspective. As soon as the crop boundaries are stretched out you will be distorting the view. You need the camera to be far back enough to include the whole view without cropping. Looking at your image, I would expect those corners to look longer, being viewed at an angle - you're looking at the hypotonuse length there. With regard to the tower view, as soon as the camera is looking down the building will flare out at the top. This happens with a true photograph also, except that you are not able to stretch the photograph out to see the top generally. I know that 3DS max has different focal lengths for the cameras, but I don't think that this will fix your problem, as the relationship between the lines in plan does not change. The most accurate view that you will get is to place the camera in a position that you don't have to stretch the crop lines out, only stretching them inwards to reduce the height of the image.
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Thanks tim, yeah I havnt been changing the crop boundaries. Gave it a go in max but still the same result. Is their anyone out their that has a very good understanding of perspective and would be able to let me know what this particalar form would look like? Is what is shown in the image accurate.? Looks kinda exagerated to me...
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I believe that the image is accurate. Prior to 3D software we had to contruct perspective views with a pencil. This involves taking points from the elevations and plans to create one point, two point or three point (z axis) perspective views - a really tedious process, discovered during the renaissance. The result would be the same. If you look at the camera in a plan view and look at where the projection lines from the camera intersect the geometry you will see that there is only one place that the points are correctly placed. Try this - create an elevation from the same point that the camera is placed with the same angle. This will give you the same view as a perspective from an infinite distance. Do the overhangs still look incorrect?
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Thanks tim, yes, placing an elevation at the camera position has allowed me to prove that the perspective of the camera was not not stretching the image. Now more confident about what the camera is showing. Cheers
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