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I am having trouble rendering the attached scene without artifacts and
gaps in the isosurface. I already increased the scale of the scene by
200 and the max_gradient of the isosurface to 100. Anyone have any tips?
Mike
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Attachments:
Download 'cieluv_color_solid_cube_isosurface.pov.txt' (13 KB)
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On 12/6/2016 2:05 AM, Mike Horvath wrote:
> I am having trouble rendering the attached scene without artifacts and
> gaps in the isosurface. I already increased the scale of the scene by
> 200 and the max_gradient of the isosurface to 100. Anyone have any tips?
>
> Mike
If you get an error about the missing image maps, you can ignore it and
delete the polygons.
Mike
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On 12/6/2016 2:05 AM, Mike Horvath wrote:
> I am having trouble rendering the attached scene without artifacts and
> gaps in the isosurface. I already increased the scale of the scene by
> 200 and the max_gradient of the isosurface to 100. Anyone have any tips?
>
> Mike
I tried with Wikipedia's conversion formula as well, with no difference
in the render.
// Wikipedia calculations
#declare funcLUV2XYZu = function(L,U,V) {U/13/L + uPrime}
#declare funcLUV2XYZv = function(L,U,V) {V/13/L + vPrime}
#declare funcLUV2XYZa2 = function(L,U,V) {XYZWhiteReference2 * select(8
- L, pow((L + 16)/116, 3), L * pow(3/29, 3))}
#declare funcLUV2XYZa1 = function(L,U,V) {funcLUV2XYZa2(L,U,V) * 9/4 *
funcLUV2XYZu(L,U,V)/funcLUV2XYZv(L,U,V)}
#declare funcLUV2XYZa3 = function(L,U,V) {funcLUV2XYZa2(L,U,V) * (12 - 3
* funcLUV2XYZu(L,U,V) - 20 * funcLUV2XYZv(L,U,V))/4/funcLUV2XYZv(L,U,V)}
Mike
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Am 06.12.2016 um 08:05 schrieb Mike Horvath:
> I am having trouble rendering the attached scene without artifacts and
> gaps in the isosurface. I already increased the scale of the scene by
> 200 and the max_gradient of the isosurface to 100. Anyone have any tips?
You seem to be running into /some/ kind of problem when the RGB values
get excessively low.
Clipping the C parameter of the fD function to some near-zero negative
value seems to do the trick:
#declare fClip = function(X,A) {select(X-A,A,X)}
#declare fD = function(C) {abs(fClip(C,-0.1)-0.5)-0.5}
This lets you get away with a max_gradient of 20.
(You still have a coincident surfaces problem between the isosurface and
the box, but I guess you can figure that one out yourself.)
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On 12/6/2016 11:55 PM, clipka wrote:
> #declare fClip = function(X,A) {select(X-A,A,X)}
> #declare fD = function(C) {abs(fClip(C,-0.1)-0.5)-0.5}
That helped, thanks. I still had to raise max_gradient to get rid o
every artifact though.
Mike
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On 12/6/2016 11:55 PM, clipka wrote:
> Am 06.12.2016 um 08:05 schrieb Mike Horvath:
>> I am having trouble rendering the attached scene without artifacts and
>> gaps in the isosurface. I already increased the scale of the scene by
>> 200 and the max_gradient of the isosurface to 100. Anyone have any tips?
>
> You seem to be running into /some/ kind of problem when the RGB values
> get excessively low.
>
> Clipping the C parameter of the fD function to some near-zero negative
> value seems to do the trick:
>
> #declare fClip = function(X,A) {select(X-A,A,X)}
> #declare fD = function(C) {abs(fClip(C,-0.1)-0.5)-0.5}
>
> This lets you get away with a max_gradient of 20.
>
> (You still have a coincident surfaces problem between the isosurface and
> the box, but I guess you can figure that one out yourself.)
>
I changed the camera angle and the problem reappeared.
camera
{
// #local cam_distance = 40; // render at 8192x8192
// #local cam_planesize = 4; // render at 8192x8192
#local cam_distance = 17;
#local cam_planesize = 1.7;
// #local cam_distance = 20; // render at 4096x4096
// #local cam_planesize = 2; // render at 4096x4096
#local cam_aspectratio = image_width/image_height;
// orthographic
location -z * cam_distance
direction +z * cam_distance
right +x * cam_planesize*cam_aspectratio
up +y * cam_planesize
rotate +x * asind(tand(30))
// rotate +x * 90
rotate -y * 045
// rotate +y * 180
rotate +y * RotateAmount
translate 1/2
scale ScaleAmount
}
max_gradient is set to 200, and I am using your revised fD function.
Mike
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On 12/7/2016 8:41 PM, Mike Horvath wrote:
> On 12/6/2016 11:55 PM, clipka wrote:
>> Am 06.12.2016 um 08:05 schrieb Mike Horvath:
>>> I am having trouble rendering the attached scene without artifacts and
>>> gaps in the isosurface. I already increased the scale of the scene by
>>> 200 and the max_gradient of the isosurface to 100. Anyone have any tips?
>>
>> You seem to be running into /some/ kind of problem when the RGB values
>> get excessively low.
>>
>> Clipping the C parameter of the fD function to some near-zero negative
>> value seems to do the trick:
>>
>> #declare fClip = function(X,A) {select(X-A,A,X)}
>> #declare fD = function(C) {abs(fClip(C,-0.1)-0.5)-0.5}
>>
>> This lets you get away with a max_gradient of 20.
>>
>> (You still have a coincident surfaces problem between the isosurface and
>> the box, but I guess you can figure that one out yourself.)
>>
>
> I changed the camera angle and the problem reappeared.
>
> camera
> {
> // #local cam_distance = 40; // render at 8192x8192
> // #local cam_planesize = 4; // render at 8192x8192
> #local cam_distance = 17;
> #local cam_planesize = 1.7;
> // #local cam_distance = 20; // render at 4096x4096
> // #local cam_planesize = 2; // render at 4096x4096
> #local cam_aspectratio = image_width/image_height;
> // orthographic
> location -z * cam_distance
> direction +z * cam_distance
> right +x * cam_planesize*cam_aspectratio
> up +y * cam_planesize
> rotate +x * asind(tand(30))
> // rotate +x * 90
> rotate -y * 045
> // rotate +y * 180
> rotate +y * RotateAmount
> translate 1/2
> scale ScaleAmount
> }
>
> max_gradient is set to 200, and I am using your revised fD function.
>
> Mike
>
And seen from directly above the isosurface disappears completely.
Mike
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