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perhaps I should clarify....
I would like to have a line similar to the following...
#declare light_source = camera_location + <0,1,0>
yet, I can't seem to manage. Any ideas???
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In article <394### [at] julian uwoca>, rsibbald
<rsi### [at] julianuwoca> wrote:
>perhaps I should clarify....
>
> I would like to have a line similar to the following...
>
>#declare light_source = camera_location + <0,1,0>
>
> yet, I can't seem to manage. Any ideas???
>
What problems are you having? The above should work, as long as you
always want your light source to be 'on a pole' 1 unit higher than your
camera's location.
#declare camera_location = <0,0,-5>
#declare light_location = camera_location + <0,1,0>
should result in a 'light_location' of <0,1,-5>.
Jerry
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> The problem arises when I attempt an animation in which
the camera is moving and I want a spotlight to follow the same path
without having to write the lights path seperately.
The message I get when trying what's below is...
"cannot assign uninitialized identifier"
ANY IDEAS?
>
>
> What problems are you having? The above should work, as long as you
> always want your light source to be 'on a pole' 1 unit higher than your
> camera's location.
>
> #declare camera_location = <0,0,-5>
>
> #declare light_location = camera_location + <0,1,0>
>
> should result in a 'light_location' of <0,1,-5>.
>
> Jerry
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Try this,
#declare ex=0
#declare why=0
#declare zee=-10
light_source {
<ex,why,zee>
White
rotate why*360*clock
}
camera {
location <ex,why*1,zee>
look_at 0
rotate why*360*clock
}
I hope that helps
C.J. - POV User
www.crosswinds.net/~povstudy
rsibbald <rsi### [at] julianuwoca> wrote in message
news:394### [at] julianuwoca...
> perhaps I should clarify....
>
> I would like to have a line similar to the following...
>
> #declare light_source = camera_location + <0,1,0>
>
> yet, I can't seem to manage. Any ideas???
>
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On Mon, 19 Jun 2000 14:07:42 -0400, rsibbald <rsi### [at] julianuwoca>
wrote:
>> The problem arises when I attempt an animation in which
>>the camera is moving and I want a spotlight to follow the same path
>>without having to write the lights path seperately.
>>The message I get when trying what's below is...
>> "cannot assign uninitialized identifier"
>
>>ANY IDEAS?
The identifier 'camera_location' is uninitialized. There's nothing
wrong with this as you have probably not initialized it :) Try
something like this:
#declare camera_location = (some_stuff_that_returns_a_vector);
#declare light_location = camera_location + <0,5,-10>;
camera
{
location camera_location
look_at camera_location + <0,-1,5>
}
light_source
{
light_location color White
spotlight
radius 15 falloff 45 tightness 75
}
You get the idea. If it's not clear, don't hesitate to ask.
Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] usanet
TAG e-mail : pet### [at] tagpovrayorg
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rsibbald wrote:
> perhaps I should clarify....
>
> I would like to have a line similar to the following...
>
> #declare light_source = camera_location + <0,1,0>
>
> yet, I can't seem to manage. Any ideas???
Look at the docs for spotlights - you will find the point_at keyword
which can be used as follows
#declare camloc = <1,1,1>;//cam position in any one frame
#declare spotloc = camloc+y*3;//make the spot location be 3 pov units
above the camera location
#declare look = <0,0,0>;//cam lookat position in any one frame
camera{
location camloc
look_at look //look at this point
...
}
light_source {
spotloc
spotlight
point_at camloc //point at the camera
// point_at look //point the spotlight at this point (where the
camera is looking)
rgb 1
}
Hope I was of some/any help
Pabs
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