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Comments
i try to revers a plane added uber area lighting
and its succeed revers
light will illuminate form opposite direction
and i try revers a cube , but cube is like sphere the normal vector still outside
same as any closed geometric cylinder cone torus , normal always outside
whats going on
I do not think it's the sphere. I think there's something else going on here...
Subbing an uber environment sphere for the primitive didn't solve it. But the uber light shader itself is functioning properly on other primitive surfaces so that shouldn't be the core issue either.
I tried a sphere with reversed normals I made in Hexagon... THAT did not work either.
I suspect this may be related to the fix for models flipped by negative scaling them appearing black. It may come down to a choice of the lesser evil if that's so, since being able to reverse an item by scaling it to -100% is also a useful trick.
That does not explain what happened for wancow though. Vexing when something works..but only sometimes.
OMG I need to sleep now
i am from japan
so whatever thanks you a lot
Sorry it's still unresoved... hopefully by the time you wake up, someone will have figured it out...
No one has said if there tried a Shpere from the Create Primative menu and not Uber Primatives. I can't test anything as i don't have assess to Daz Studio at all. Last time I used this was 4.5.1.6 and it worked on a Pimative Sphere. This is not to say that the latest version hasn't go a bug regarding this. :)
I did try with a sphere from hexagon with reversed normals... should that not have worked?
I did since that was the instructions in the tutorial. Also tried with a pre created environment sphere and that did not function either at 100 or -100.
I did since that was the instructions in the tutorial. Also tried with a pre created environment sphere and that did not function either at 100 or -100.
the regular Area Light Sphere worked for me when I scaled it negatively
incase you can't read it, the sphere is scaled -4000%
uber Area light sphere negatively scaled to 3800% (thats -3800%)
ok just to be thorough, I ran through the tutorial the OP is attempting..
nice tutorial wish I discovered it sooner..
anyway, no issues on my end, did everything step by step with the video.
Well...some interesting points.
Just to check, I created a sphere in Blender. I flipped the normals, gave it a material and UV mapped it before export. On import to DS I applied UA. Rendered...inside lit up, outside black
Back to Blender...chopped the sphere in half, created an integral 'floor' assigned two materials (dome and floor). Back in DS, assigned UA to the dome. Rendered...inside lit up, outside black.
Then I applied SubD to is...Rendered...inside black...outside lit.
Then I created a DS primitive sphere...and black inside, no matter what the scaling is/was...
Hi...
Well I just finished running through a multitude of tests on the last 4 versions and confirmed what I suspected to be the cause and I believe Richard is correct...
A bug fix was added in the 4.5.1.49 Beta to correct reversed normals on models with negative scale values that are sent to 3Delight...
4.5.1.6 and 4.5.1.41 Beta both work as you would normally expect with negative scale... the light will emit inwards...
4.5.1.49 Beta and 4.5.1.56 no longer work because the normals are being corrected to face outward...
The results would be expected now since the AreaLight is a Surface Shader...
@Rareth... what version of Studio are you using?
While this is an unfortunate side effect of the fix... being able to invert a figure or prop is very useful...
Also it's not a total loss... the UberEnvironment2 sphere does work correctly, since it's a Light Shader and not a Surface Shader...
nicci... :)
Hi...
Now that's interesting... and I would suspect that Studios SubD is converting the mesh then...
Yep...
nicci... :)
Wierd things a foot. Sounds and smells like bug then probably a bug...has anyone reported it yet?
Not a bug...but a BUG FIX!
Like Nicci and Richard, that's the conclusion I've come to...the fix for the old problem basically makes it so the normals are always facing out on negatively scaled items...
Now, if I can make an arealight shader that will emit in the opposite direction of the normal...or if there was a way to set which direction the normals pointed when creating the primitives. I wonder how hard it would be to write a script to invert the normals?
ETA:
I took the DZAreaLight (a DS3 SDK example light, recompiled in DS4.x) and inverted the normal, recompiled it and it works like expected with negatively scaled primitives. One more bit confirming that the normals are now always 'facing out' on them.
4.5.1.6 Pro..
Ok as I said last time i used it was with DS 4.5.1.6
Can someone try this.
Load a Primative Sphere 1000 Mtr 24,24
Apply Uber Area Base before rescaling
Then rescale and reposittion and see if that works
I'll give it a shot, but I don't think it will matter if UA is applied before or after scaling, because I think the 'fix' automatically' flips the normals...
Rendering...will post when before/afters are done.
As I thought...no difference...
Image 1 Before scaling
Image 2 After scaling
(yes, low q-render...speed over substance)
Well I went and Installed DS4.5.1.6 on my Wife's Laptop and did a quick test myself. Though it runs terrible on this laptop I did manage it.
I got light inside. :)
Basically, it flips the normals out, from what I can tell, when you go to render. Yeah, it fixes a problem with black rendering when it's unintentional, but it breaks intentionally turning a mesh inside out.
I guess I'll go an upload a 24 x 24 sphere, I won't UV map it. I'll have it at 10m DS scale. The Normals will be pointing in...
MJC, anxiously awaiting that! Thank you!
Sorry mjc are you saying it still won't work as it does in 4.5.1.6 everytime I tried. Just as the video describes.
Right...light on the outside, only...after v 4.5.1.49 (.43, actually but that wasn't an 'available' beta), you can't turn an object inside out by using negative scaling. You actually have to flip the normals...somehow.
Oh well what a stupid thing to do. :)
As noted earlier, it helps if people want to use negative scale to make a mirror image of an item. There are competing desires here, so what we really need is some kind of property - perhaps at the object level, perhaps a material setting - that lets the user pick which way the mesh, or a material zone on the mesh, behaves.