<br>Hello sir.<br><br>Thanks a lot for your kindness.. Now its bot clear to me and I'm sure i'll come out with the result.<br><br>Thanks for your guidance.. Thanks a lot.<br><br>Regards<br>Rakesh Patil<br><blockquote><br>---------- Original message ----------<br>From:David Gobbi< david.gobbi@gmail.com ><br>Date: 09 Feb 10 19:52:32<br>Subject: Re: rescaling glyphs.??<br>To: Rakesh Patil <rakeshthp@in.com><br><br>Hi Rakesh,<br><br>This will have to be the last email that I answer in this discussion.<br><br>Since every glyph is at a different position, you will have to do the<br>computation for every glyph.<br><br>The result of the dot product is the depth. Once you have the depth,<br>you must compute the scale factor. Here's a hint: the scale factor<br>will be proportional to 1/depth.<br><br>Good luck.<br><br> David<br><br><br>On Tue, Feb 9, 2010 at 7:13 AM, Rakesh Patil <rakeshthp@in.com> wrote:<br>> hello sir,<br>><br>> Now suppose, i have to show glyphs
at following positions:<br>><br>> 78.23564 8.28372 -5<br>> 78.32127 8.32736 -10<br>> 78.34723 8.42864 50<br>> ...<br>> 80.23574 9.37256 1800<br>><br>> then, for each point i need to calculate the difference and get the dot<br>> product with projection direction??<br>><br>> is the result of these dot products the scale factor??<br>> Coz in that code i didnt find and depth parameter.. only position is there..<br>> Am i correct??<br>><br>> Thanks<br>><br>> ---------- Original message ----------<br>> From:David Gobbi< david.gobbi@gmail.com ><br>> Date: 09 Feb 10 19:05:11<br>> Subject: Re: rescaling glyphs.??<br>> To: Rakesh Patil<br>><br>> Let camera position be p1, which you can get from camera->GetPosition().<br>><br>> Let object position be p2, i.e. the position of a glyph.<br>><br>> The vector "v" is the p2 - p1:<br>> v[0] = p2[0] - p1[0];<br>> v[1] = p2[1] - p1[1];<br>> v[2] =
p2[2] - p1[2];<br>><br>> That's all there is to it.<br>><br>><br>><br>> On Tue, Feb 9, 2010 at 6:24 AM, Rakesh Patil wrote:<br>>> Hello sir,<br>>><br>>> Thanks a lot for you guidance. Please pardon me if am going wrong at any<br>>> point.<br>>> I'm am still not clear with this point what you said<br>>><br>>> "The depth is the dot product of the camera's direction-of-projection with<br>>> the vector from the camera's position to the object's position."<br>>><br>>> what exactly is a vector from the camera's position to object's position??<br>>><br>>> Thanks<br>><br></rakeshthp@in.com></rakeshthp@in.com></blockquote>