 |
|
|
|
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Are there any old scenes or renders that I can use to compare behavior
in old and current versions of POV-Ray? By default, using 1 lumens the
daylight scenes seem dim and washed out. I have to pump up the lumens to
2 or 3 to get nice daylight colors and brightness. Thanks.
Mike
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
On 2/22/2018 11:56 PM, Mike Horvath wrote:
> Are there any old scenes or renders that I can use to compare behavior
> in old and current versions of POV-Ray? By default, using 1 lumens the
> daylight scenes seem dim and washed out. I have to pump up the lumens to
> 2 or 3 to get nice daylight colors and brightness. Thanks.
>
>
> Mike
This is a render with 2 lumens:
https://i.imgur.com/wHmo76S.jpg
This is a render with 3 lumens:
https://i.imgur.com/Q50eHAz.jpg
Here is the code I am using.
// -------------------------------------------------------------
// Nonstandard includes
#include "CIE.inc" //
http://www.ignorancia.org/en/index.php?page=Lightsys
#include "lightsys.inc" //
http://www.ignorancia.org/en/index.php?page=Lightsys
#include "lightsys_constants.inc" //
http://www.ignorancia.org/en/index.php?page=Lightsys
// -------------------------------------------------------------
// Lights
// Sun is not at realistic distance and is not an area light like it
should be.
// Could use "sunpos.inc" here too to determine a correct position and
angle.
#declare light_source_lumens = 3; // float
#declare light_source_temp = Daylight(6100); // float
#declare light_source_color =
Light_Color(light_source_temp,light_source_lumens); // float
#declare light_source_location = vrotate(<0,0,-1000000000>,
<-060,-060,+000>); // needs to be far enough above the clouds to cast
shadows
light_source
{
light_source_location
srgb light_source_color
parallel
point_at <0,0,0>
}
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Le 18-02-23 à 00:00, Mike Horvath a écrit :
> On 2/22/2018 11:56 PM, Mike Horvath wrote:
>> Are there any old scenes or renders that I can use to compare behavior
>> in old and current versions of POV-Ray? By default, using 1 lumens the
>> daylight scenes seem dim and washed out. I have to pump up the lumens
>> to 2 or 3 to get nice daylight colors and brightness. Thanks.
>>
>>
>> Mike
>
> This is a render with 2 lumens:
>
> https://i.imgur.com/wHmo76S.jpg
>
> This is a render with 3 lumens:
>
> https://i.imgur.com/Q50eHAz.jpg
>
> Here is the code I am using.
>
>
>
> // -------------------------------------------------------------
> // Nonstandard includes
>
> #include "CIE.inc" //
> http://www.ignorancia.org/en/index.php?page=Lightsys
> #include "lightsys.inc" //
> http://www.ignorancia.org/en/index.php?page=Lightsys
> #include "lightsys_constants.inc" //
> http://www.ignorancia.org/en/index.php?page=Lightsys
>
>
> // -------------------------------------------------------------
> // Lights
> // Sun is not at realistic distance and is not an area light like it
> should be.
> // Could use "sunpos.inc" here too to determine a correct position and
> angle.
>
> #declare light_source_lumens = 3; // float
> #declare light_source_temp = Daylight(6100); // float
> #declare light_source_color =
> Light_Color(light_source_temp,light_source_lumens); // float
> #declare light_source_location = vrotate(<0,0,-1000000000>,
> <-060,-060,+000>); // needs to be far enough above the clouds
> to cast shadows
>
> light_source
> {
> light_source_location
> srgb light_source_color
> parallel
> point_at <0,0,0>
> }
lightsys assume that you are using a linear colour space : Use rgb, not
srgb. Also, use assumed_gamma 1.
If you use srgb, then light components that are larger than 1 will get
their value reduced, potentially making your light somewhat dimer.
Alain
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Le 18-02-23 à 00:00, Mike Horvath a écrit :
> On 2/22/2018 11:56 PM, Mike Horvath wrote:
>> Are there any old scenes or renders that I can use to compare behavior
>> in old and current versions of POV-Ray? By default, using 1 lumens the
>> daylight scenes seem dim and washed out. I have to pump up the lumens
>> to 2 or 3 to get nice daylight colors and brightness. Thanks.
>>
>>
>> Mike
>
> This is a render with 2 lumens:
>
> https://i.imgur.com/wHmo76S.jpg
>
> This is a render with 3 lumens:
>
> https://i.imgur.com/Q50eHAz.jpg
>
> Here is the code I am using.
>
>
>
> // -------------------------------------------------------------
> // Nonstandard includes
>
> #include "CIE.inc" //
> http://www.ignorancia.org/en/index.php?page=Lightsys
> #include "lightsys.inc" //
> http://www.ignorancia.org/en/index.php?page=Lightsys
> #include "lightsys_constants.inc" //
> http://www.ignorancia.org/en/index.php?page=Lightsys
>
>
> // -------------------------------------------------------------
> // Lights
> // Sun is not at realistic distance and is not an area light like it
> should be.
> // Could use "sunpos.inc" here too to determine a correct position and
> angle.
>
> #declare light_source_lumens = 3; // float
> #declare light_source_temp = Daylight(6100); // float
> #declare light_source_color =
> Light_Color(light_source_temp,light_source_lumens); // float
> #declare light_source_location = vrotate(<0,0,-1000000000>,
> <-060,-060,+000>); // needs to be far enough above the clouds
> to cast shadows
>
> light_source
> {
> light_source_location
> srgb light_source_color
> parallel
> point_at <0,0,0>
> }
The 3 lumen looks a little to bright.
Can you post the 1 lumen image?
Also, the sun position is not the same for the two images. It mover by
around 40°.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
On 2/23/2018 8:18 AM, Alain wrote:
> The 3 lumen looks a little to bright.
> Can you post the 1 lumen image?
>
> Also, the sun position is not the same for the two images. It mover by
> around 40°.
Here it is with RGB instead of SRGB, and 1 lumens.
https://i.imgur.com/AcGBbla.jpg
As you can see, it is pretty dim and lifeless.
Mike
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Le 18-02-24 à 11:07, Mike Horvath a écrit :
> On 2/23/2018 8:18 AM, Alain wrote:
>> The 3 lumen looks a little to bright.
>> Can you post the 1 lumen image?
>>
>> Also, the sun position is not the same for the two images. It mover by
>> around 40°.
>
> Here it is with RGB instead of SRGB, and 1 lumens.
>
> https://i.imgur.com/AcGBbla.jpg
>
> As you can see, it is pretty dim and lifeless.
>
>
> Mike
Slightly dimmer, not prety dim, than the 2 lumens but not lifeless on my
monitor. Maybe your monitor is set to dim...
Definitively better than the 3 lumens version.
Set assumed_gamma 1
When using lightsys, always use RGB for the lights. lightsys is made to
return values in the rgb colour space, not the srgb one. You may use
srgb for the textures.
Alain
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
On 24-2-2018 17:07, Mike Horvath wrote:
> On 2/23/2018 8:18 AM, Alain wrote:
>> The 3 lumen looks a little to bright.
>> Can you post the 1 lumen image?
>>
>> Also, the sun position is not the same for the two images. It mover by
>> around 40°.
>
> Here it is with RGB instead of SRGB, and 1 lumens.
>
> https://i.imgur.com/AcGBbla.jpg
>
> As you can see, it is pretty dim and lifeless.
>
On my screen it looks right.
I often use CIE.inc myself, maybe in a little different way than you do.
This is an example of how I define my sunlight in a scene:
//start code -----------------------------------
#include "CIE.inc"
#if (Fog)
#local Intensity = 5;
#else
#local Intensity = 3;
#end
//Sun's temperature (Kelvin): 2800=red; 7500=blue white
#declare SunColor = Blackbody(6500)*Intensity;
#declare SunPosition = <0, 0, -2>*10e4;
#declare SunDis = vlength(SunPosition)*2/215;
#declare Sun_alt = 60;
#declare Sun_azm = -115;
#if (Area)
#debug "\nUsing an area_light for the Sun.\n"
light_source{
<0, 0, 0>
color SunColor
area_light
SunDis*x, SunDis*z, // lights spread out (x * z)
4, 4 // total lights in grid (4x*4z = 16 lights)
adaptive 1 // 0,1,2,3...
area_illumination on // full area diffuse and specular
jitter // adds random softening of light
circular // make the shape of the light circular
orient // orient light
translate SunPosition
rotate Sun_alt*x
rotate Sun_azm*y
parallel
point_at <0, 0, 0>
media_interaction on
media_attenuation off
}
#else
light_source {
<0, 0, 0>
color rgb SunColor
translate SunPosition
rotate Sun_alt*x
rotate Sun_azm*y
parallel
point_at <0, 0, 0>
media_interaction on
media_attenuation off
}
#end
//end code -----------------------------------
--
Thomas
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Le 18-02-25 à 02:53, Thomas de Groot a écrit :
> On 24-2-2018 17:07, Mike Horvath wrote:
>> On 2/23/2018 8:18 AM, Alain wrote:
>>> The 3 lumen looks a little to bright.
>>> Can you post the 1 lumen image?
>>>
>>> Also, the sun position is not the same for the two images. It mover
>>> by around 40°.
>>
>> Here it is with RGB instead of SRGB, and 1 lumens.
>>
>> https://i.imgur.com/AcGBbla.jpg
>>
>> As you can see, it is pretty dim and lifeless.
>>
>
> On my screen it looks right.
>
> I often use CIE.inc myself, maybe in a little different way than you do.
> This is an example of how I define my sunlight in a scene:
>
> //start code -----------------------------------
> #include "CIE.inc"
> #if (Fog)
> #local Intensity = 5;
> #else
> #local Intensity = 3;
> #end
> //Sun's temperature (Kelvin): 2800=red; 7500=blue white
> #declare SunColor = Blackbody(6500)*Intensity;
> #declare SunPosition = <0, 0, -2>*10e4;
> #declare SunDis = vlength(SunPosition)*2/215;
> #declare Sun_alt = 60;
> #declare Sun_azm = -115;
>
> #if (Area)
> #debug "\nUsing an area_light for the Sun.\n"
> light_source{
> <0, 0, 0>
> color SunColor
> area_light
> SunDis*x, SunDis*z, // lights spread out (x * z)
A better, more descriptive, name would be "SunDiam"
> 4, 4 // total lights in grid (4x*4z = 16
lights)
This will actually use a 5 by 5 array...
> adaptive 1 // 0,1,2,3...
...and start with a 3 by 3 one.
With adaptive, you can use a much larger value, like 17 or 33 without
increasing the render time much.
adaptive 0 DON'T turn the feature off, but start with a 2 by 2 array.
> area_illumination on // full area diffuse and specular
> jitter // adds random softening of light
Makes the penumbra grainy if using a sparse array.
> circular // make the shape of the light circular
> orient // orient light
> translate SunPosition
> rotate Sun_alt*x
> rotate Sun_azm*y
> parallel
> point_at <0, 0, 0>
> media_interaction on
> media_attenuation off
> }
> #else
> light_source {
> <0, 0, 0>
> color rgb SunColor
> translate SunPosition
> rotate Sun_alt*x
> rotate Sun_azm*y
> parallel
> point_at <0, 0, 0>
> media_interaction on
> media_attenuation off
> }
> #end
> //end code -----------------------------------
>
>
Using adaptive, you need larger arrays to get all the benefit. Some
suggested sizes in relation with the adaptive steps values :
adaptive 0 (0 initial subdivisions) at least 5 by 5 (2 steps)
adaptive 1 (1 initial subdivisions) at least 9 by 9 (3 steps)
adaptive 2 (2 initial subdivisions) at least 17 by 17 (4 steps)
adaptive 3 (3 initial subdivisions) at least 33 by 33 (5 steps)
You can always use larger arrays to get smoother results.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
On 26-2-2018 1:03, Alain wrote:
> Le 18-02-25 à 02:53, Thomas de Groot a écrit :
>> On 24-2-2018 17:07, Mike Horvath wrote:
>>> On 2/23/2018 8:18 AM, Alain wrote:
>>>> The 3 lumen looks a little to bright.
>>>> Can you post the 1 lumen image?
>>>>
>>>> Also, the sun position is not the same for the two images. It mover
>>>> by around 40°.
>>>
>>> Here it is with RGB instead of SRGB, and 1 lumens.
>>>
>>> https://i.imgur.com/AcGBbla.jpg
>>>
>>> As you can see, it is pretty dim and lifeless.
>>>
>>
>> On my screen it looks right.
>>
>> I often use CIE.inc myself, maybe in a little different way than you
>> do. This is an example of how I define my sunlight in a scene:
>>
>> //start code -----------------------------------
>> #include "CIE.inc"
>> #if (Fog)
>> #local Intensity = 5;
>> #else
>> #local Intensity = 3;
>> #end
>> //Sun's temperature (Kelvin): 2800=red; 7500=blue white
>> #declare SunColor = Blackbody(6500)*Intensity;
>> #declare SunPosition = <0, 0, -2>*10e4;
>> #declare SunDis = vlength(SunPosition)*2/215;
>> #declare Sun_alt = 60;
>> #declare Sun_azm = -115;
>>
>> #if (Area)
>> #debug "\nUsing an area_light for the Sun.\n"
>> light_source{
>> <0, 0, 0>
>> color SunColor
>> area_light
>> SunDis*x, SunDis*z, // lights spread out (x * z)
>
> A better, more descriptive, name would be "SunDiam"
>
>> 4, 4 // total lights in grid (4x*4z = 16
lights)
>
> This will actually use a 5 by 5 array...
>
>> adaptive 1 // 0,1,2,3...
>
> ...and start with a 3 by 3 one.
> With adaptive, you can use a much larger value, like 17 or 33 without
> increasing the render time much.
> adaptive 0 DON'T turn the feature off, but start with a 2 by 2 array.
>
>> area_illumination on // full area diffuse and specular
>> jitter // adds random softening of light
>
> Makes the penumbra grainy if using a sparse array.
>
>> circular // make the shape of the light circular
>> orient // orient light
>> translate SunPosition
>> rotate Sun_alt*x
>> rotate Sun_azm*y
>> parallel
>> point_at <0, 0, 0>
>> media_interaction on
>> media_attenuation off
>> }
>> #else
>> light_source {
>> <0, 0, 0>
>> color rgb SunColor
>> translate SunPosition
>> rotate Sun_alt*x
>> rotate Sun_azm*y
>> parallel
>> point_at <0, 0, 0>
>> media_interaction on
>> media_attenuation off
>> }
>> #end
>> //end code -----------------------------------
>>
>>
>
> Using adaptive, you need larger arrays to get all the benefit. Some
> suggested sizes in relation with the adaptive steps values :
> adaptive 0 (0 initial subdivisions) at least 5 by 5 (2 steps)
> adaptive 1 (1 initial subdivisions) at least 9 by 9 (3 steps)
> adaptive 2 (2 initial subdivisions) at least 17 by 17 (4 steps)
> adaptive 3 (3 initial subdivisions) at least 33 by 33 (5 steps)
>
> You can always use larger arrays to get smoother results.
Thanks Alain, well spotted indeed. I always unthinkingly use the set up
as is. ;-)
--
Thomas
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
On 2/24/2018 12:23 PM, Alain wrote:
> Le 18-02-24 à 11:07, Mike Horvath a écrit :
>> On 2/23/2018 8:18 AM, Alain wrote:
>>> The 3 lumen looks a little to bright.
>>> Can you post the 1 lumen image?
>>>
>>> Also, the sun position is not the same for the two images. It mover
>>> by around 40°.
>>
>> Here it is with RGB instead of SRGB, and 1 lumens.
>>
>> https://i.imgur.com/AcGBbla.jpg
>>
>> As you can see, it is pretty dim and lifeless.
>>
>>
>> Mike
>
> Slightly dimmer, not prety dim, than the 2 lumens but not lifeless on my
> monitor. Maybe your monitor is set to dim...
> Definitively better than the 3 lumens version.
>
> Set assumed_gamma 1
> When using lightsys, always use RGB for the lights. lightsys is made to
> return values in the rgb colour space, not the srgb one. You may use
> srgb for the textures.
>
>
> Alain
My monitor is set to "SRGB". Dunno what it should be set to.
Mike
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
|
|
