hi
i ahve made a 3d model of our college library in radiance.now i wnat to make a walkthrough . but i dont know how to do that ,and what all are the equation i need to give .
the dimension of library are 796 X 312 X 120 inches.
could u please help me
thanking u
gurneet
Hi Gurneet,
There really needs to be a FAQ on generating animation paths. Peter Apian-Bennewitz wrote a program called rshow that may be used to interactively walk through a space using OpenGL rendering, and has options for storing keyframes and generating view sequences, which may then be rendered in batch mode or using ranimate.
I often choose keyframes myself in rview (or the new rholo program), utilizing the "view" or 'V' commands to output views at desired points along the animation path. These may then be constructed into a path using a spline generator or the spline.cal program that may be found in ray/src/cal/cal in the radiance distribution. You take the views output by rview or rholo, which look like so (these are not commands -- they are views stored by rview into a file):
rview -vtv -vp 5.46 15.5 4.2 -vd 0.91674 0.347628 -0.196833 -vu 0 0 1 -vh 60 -vv 49 -vs 0 -vl 0 -t 1
rview -vtv -vp 10.5 15.6 4.2 -vd 0.9896 -0.1408 -0.0294619 -vu 0 0 1 -vh 60 -vv 49 -vs 0 -vl 0 -t 2
rview -vtv -vp 20.4 13.7 4.2 -vd 0.680414 -0.680414 -0.272166 -vu 0 0 1 -vh 60 -vv 49 -vs 0 -vl 0 -t 4
The -t options at the end were added manually, indicating the expected distance (in seconds) between the previous frame and this one. These options may be added within rview may appending them to the view command, like so:
: view key.vf -t 2
Once you have the above file (key.vf), you can create a format file for rcalc to extract the values you are interested in, and pass these to the tabfunc program to get them into the form you need for spline.cal. Create a file called "key.fmt" that contains the following single line:
rview -vtv -vp \{px\} {py} \{pz\} \-vd {dx} \{dy\} {dz} -vu 0 0 1 -vh \{vh\} \-vv {vv} -vs 0 -vl 0 -t ${t}
Then, run the following command to extract the desired values from your keyframe file and put them into a form that may be passed to rcalc as a .cal file:
% rcalc -i key.fmt -e '$1=recno;$2=px;$3=py;$4=pz;$5=dx;$6=dy;$7=dz;$8=vh;$9=vv;$10=t' key.vf \
> tabfunc Px Py Pz Dx Dy Dz H V T > key.cal
This new file, "key.cal", may then be used with rcalc to generate a set of desired inbetween views, spaced evenly in time. If your total sum of times is 30 seconds, for example, and you want to render 10 frames/sec, you might use the following command to generate the individual frame views for ranimate:
% cnt 300 | rcalc -o key.fmt -f key.cal -f spline.cal -e 't=$1/10' \
-e 'px=s(Px);py=s(Py);pz=s(Pz);dx=s(Dx);dy=s(Dy);dz=s(Dz);vh=s(H);vv=s(V)' > anim.vf
In this command, I have used the same "key.fmt" file to generate the animation views, but you may want to produce something slightly different, which had only the changing view point and direction, for example. The above sequence allows you to vary the view position, direction, and zoom, but does not permit the up vector to change. This is rarely needed, but if you do have a tilting camera, you can always modify the commands to include this information.
I hope this is enough to get you started. Another excellent place to look for tips is Peter's chapter on animation in "Rendering with Radiance."
-Greg
···
From: "gurneet" <[email protected]>
Date: Fri, 22 Nov 2002 11:13:52 +0530
Subject: [Radiance-general] how to specify the animation pathhi
i ahve made a 3d model of our college library in radiance.now i wnat to =
make a walkthrough . but i dont know how to do that ,and what all are =
the equation i need to give .
the dimension of library are 796 X 312 X 120 inches.
could u please help me
thanking u
gurneet
Greg Ward wrote:
Hi Gurneet,
There really needs to be a FAQ on generating animation paths. Peter
Apian-Bennewitz wrote a program called rshow that may be used to
interactively walk through a space using OpenGL rendering, and has
options for storing keyframes and generating view sequences, which may
then be rendered in batch mode or using ranimate.
PS: Thanks for the reference, however the interactive path editing was
build into the older GL version of rshow running on SGI's IRIX, the
Open-GL version is still waiting for this feature.
-Peter
···
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pab-opto, Freiburg, Germany, www.pab-opto.de