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Hello
I am trying to model objects made from polypropylene. The material
is translucent (as opposed to transparent).
Here is a link that shows what the material looks like.
https://www.webstaurantstore.com/cambro-30ppch190-1-3-size-translucent-polypropylene-handled-lid/21430PPCH.html
The povray material type I am using always looks clear. I can't figure out how
to model the look of the material.
Here is what I have. Can anyone help?
#declare TranslucentPlastic =
material
{
texture
{
pigment{rgbf 1}
finish
{
diffuse 0.3
ambient 0.7
reflection{fresnel on}
phong 10.0
phong_size 60.0
}
}
interior
{
ior 1.5
}
}
--Bob
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"bzigon" <bob### [at] gmail com> wrote:
> Hello
> I am trying to model objects made from polypropylene. The material
> is translucent (as opposed to transparent).
>
> Here is a link that shows what the material looks like.
>
>
https://www.webstaurantstore.com/cambro-30ppch190-1-3-size-translucent-polypropylene-handled-lid/21430PPCH.html
>
> The povray material type I am using always looks clear. I can't figure out how
> to model the look of the material.
Use transmit, not filter, and set it less than 1, else it will be completely
transparent. There are some good docs and websites with examples.
http://xahlee.info/3d/povray-glassy.html
http://news.povray.org/povray.binaries.images/thread/%3Cweb.57a7e643418f435e7df57c0%40news.povray.org%3E/
I also thought your reflection values were a bit drastic, but I always just
tinker until I get something that works. I'm certainly no expert.
Try:
#version 3.8;
global_settings {assumed_gamma 1.0}
#include "colors.inc"
//#include "shapes.inc"
//#include "shapes2.inc"
#include "shapes3.inc"
camera {
location <0, 2, -5> // position & direction of view
look_at <0, 0, 0>
right x*image_width/image_height // horizontal size of view
up y // vertical size of view
}
plane {y, -1 pigment {checker}}
light_source {<5, 5, -30> color White}
#declare PP =
material
{
texture
{
pigment{rgbt <1, 1, 1, 0.9>}
finish
{
diffuse 0.3
ambient 0.7
reflection {0.05 fresnel on}
phong 0.25
phong_size 20.0
}
}
interior
{
ior 1.5
}
}
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
object { Half_Hollowed_Rounded_Cylinder1( //
3.2,// Len_total, // total_Lenght from end to
end
0.9,// outer radius
0.2,// border radius
1, // border scale y ( >0 ), 0 = no rounded
borders!
1 // Merge_On , // 0 = union, 1 = merge !
) //--------------------------------------------
material {PP} // end texture
scale <1,1,1>
translate <0, 0, 0>
rotate <0,0,0>
} // end of object ---------------------------------------------------
//----------------------------------------------------------------------------
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On 20/07/2018 01:10, Bald Eagle wrote:
> Use transmit, not filter, and set it less than 1, else it will be completely
> transparent. There are some good docs and websites with examples.
>
> http://xahlee.info/3d/povray-glassy.html
>
>
http://news.povray.org/povray.binaries.images/thread/%3Cweb.57a7e643418f435e7df57c0%40news.povray.org%3E/
>
> I also thought your reflection values were a bit drastic, but I always just
> tinker until I get something that works. I'm certainly no expert.
>
Also the ambient is too high.
Subsurface scattering might do it. But you might get the effect with
micro-normals.
> Try:
#declare PP0 =
material{
texture {
pigment {
colour rgbft <1.000,1.000,1.000,0.000,0.250>
/* increase t for more transparency */
}
normal {
crackle, 0.010
form < -1.000, 1.000, 0.000 >
metric 2.000
offset 0.000
scale <0.010,0.010,0.010> /* Scale micro-normals. */
}
finish {
ambient rgb <0.100,0.100,0.100>*2.500
brilliance 1.000
diffuse 0.300
phong 0.000
phong_size 1.000
specular 0.078
roughness 1.000
reflection {
rgb <0.015,0.015,0.015>, rgb <0.025,0.025,0.025>
fresnel 1
falloff 0.000
exponent 1.000
metallic 0.000
}
}
}
interior{
ior 1.500
caustics 0.000
dispersion 1.000
dispersion_samples 7.000
fade_power 0.000
fade_distance 0.000
fade_color rgb <0.000,0.000,0.000>
}
}
--
Regards
Stephen
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Le 18-07-19 à 17:28, bzigon a écrit :
> Hello
> I am trying to model objects made from polypropylene. The material
> is translucent (as opposed to transparent).
>
> Here is a link that shows what the material looks like.
>
>
https://www.webstaurantstore.com/cambro-30ppch190-1-3-size-translucent-polypropylene-handled-lid/21430PPCH.html
>
> The povray material type I am using always looks clear. I can't figure out how
> to model the look of the material.
>
> Here is what I have. Can anyone help?
>
> #declare TranslucentPlastic =
> material
> {
> texture
> {
> pigment{rgbf 1}
> finish
> {
> diffuse 0.3
> ambient 0.7
> reflection{fresnel on}
> phong 10.0
> phong_size 60.0
> }
> }
> interior
> {
> ior 1.5
> }
> }
>
> --Bob
>
>
The best way is to use subsurface light transport. Version 3.8 alpha or
Uber-POV.
To use it, you need to activate it in the global_settings block :
global_settings {
subsurface { [samples DiffuseScatteringINT, SingleScatteringINT]
[radiosity BOOL] }
}
samples default to 50, 50
Use smaller to get fraster, but grainy, render.
radiosity defaults to OFF
Next, you need to add it to the finish block of the object :
subsurface { translucency COLOR }
COLOR can be a colour vector or a float.
The values are NOT limited to the range.
If translucency is large relative to the object, then the object can
look transparent.
The effect depends on the ior of the object and it's scale.
The scale can be set globally :
global_settings{mm_per_unit INT}
Where INT represent how many milimeters are in one POV unit.
When using translucency, you should avoid colour components of zero.
Instead, use some very small values. Use rgb 0.001 instead of rgb 0 for
your black.
DON'T use diffuse 0. It can cause a crash.
Use merge instead of union.
Meshes must be well beheaved and closed.
In a CSG, use a single object whide interior.
Alain
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Le 18-07-26 à 14:16, Alain a écrit :
> The best way is to use subsurface light transport. Version 3.8 alpha or
> Uber-POV.
>
> To use it, you need to activate it in the global_settings block :
>
> global_settings {
> subsurface { [samples DiffuseScatteringINT, SingleScatteringINT]
> [radiosity BOOL] }
> }
>
> samples default to 50, 50
> Use smaller to get fraster, but grainy, render.
> radiosity defaults to OFF
>
> Next, you need to add it to the finish block of the object :
>
> subsurface { translucency COLOR }
>
> COLOR can be a colour vector or a float.
> The values are NOT limited to the range.
> If translucency is large relative to the object, then the object can
> look transparent.
>
> The effect depends on the ior of the object and it's scale.
> The scale can be set globally :
> global_settings{mm_per_unit INT}
>
> Where INT represent how many milimeters are in one POV unit.
>
> When using translucency, you should avoid colour components of zero.
> Instead, use some very small values. Use rgb 0.001 instead of rgb 0 for
> your black.
> DON'T use diffuse 0. It can cause a crash.
>
> Use merge instead of union.
> Meshes must be well beheaved and closed.
> In a CSG, use a single object whide interior.
>
>
> Alain
After looking at the picture, I suggest a transluncency value that is
just a bit larger than the thickness of your object as a starting point.
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