|
|
Reflection Bug On Vray!..
About Truespace Archives
These pages are a copy of the official truespace forums prior to their removal somewhere around 2011.
They are retained here for archive purposes only.
Reflection Bug On Vray!.. // Bugs
Post by prodigy // Aug 22, 2006, 5:37am
|
prodigy
Total Posts: 3029
|
NEw BUG FOUNDED ON VRAY!.. :(
First make a plane...
Then, Quad Divide.. x 4 clicks its ok..
2198
Select a Face... and pull Up!....
2199
OK, now make a new material..
On reflactance shaders select Mirror shader,
(or any shader with reflection)
And now render...
Cheers.... 8(
2200
I understand why this problem happends, and i found one way to "solve"
The problem (I think) its because the face on the other side of the plane "the bottom" make problems on top side..
If you delet the bottom face before click on quad divide you can fix the problem, but you lose one side AND you cant see the object if u looks from the bottom side.
TESTED ON TS 7.11 and VRay 1 :D
P4 3.0ghz Gforce 6600, XP pro, 1ghz DualChannel. |
Post by TomG // Aug 22, 2006, 6:56am
|
TomG
Total Posts: 3397
|
Planes have been problematic objects for some time, probably since tS4.3 :) The issue is one about sides etc.
The best thing is to never use planes and always use very thin cubes instead, which avoids all the issues (which can happen with modeling, or with Lightworks, as well as here with V-Ray).
It is indeed issues with single faces etc - the plane is not in fact one face, but two, one on each side (rather than a face with a normal pointing in each direction), which is what causes odd behavior at times.
So most likely this is not a V-Ray issue, but a long-standing peculiarity about planes.
HTH!
Tom |
Post by parva // Aug 22, 2006, 7:08am
|
parva
Total Posts: 822
|
Tom is right. You can also turn "single sided" for plane (right click on plane icon) on to avoid this.
I don't use double sided planes anymore. All renderers can render double sided today. |
Post by Anunnaki // Aug 22, 2006, 1:26pm
|
Anunnaki
Total Posts: 18
|
I disagree. I rendered a similar scene in Lightworks without any rendering artifacts. I appears V-Ray has trouble handling a single sided plane.
Vincent D. Brumback |
Post by prodigy // Aug 22, 2006, 1:54pm
|
prodigy
Total Posts: 3029
|
Hi all.. yup.. in lightworks this problem its not happend..
TomG; i found this "bug" or whatever you want to call because i use yesterday dinawave...and when i render.. UFFF!!
and minutes later i found how make the problem....
I think plane its important because u can use clothmotion and waves... or terrain... i never use a cube...
CYA...
Less to be a "member" jajaja |
Post by Bobbins // Aug 22, 2006, 9:05pm
|
Bobbins
Total Posts: 506
|
The problem is double sided planes and not the render engine. Lightwave (oops, typo - I meant LightWorks of course!) is perhaps more forgiving of double sided planes but that doesn't mean VRay has a 'bug' with them. Prodigy is creating the problem in step 3 of his report when he selects a face and moves it up as he tears the plane mesh. As pointed out, single sided planes are the answer here
By the way - DynaWave was designed to work properly on cubes and not planes. Using planes can cause problems with DynaWave exactly as described here which is one reason why Alain says to use a cube with the top surface quad divided with his plug-in (the other reason is due to axis locations). |
Post by prodigy // Aug 23, 2006, 5:56am
|
prodigy
Total Posts: 3029
|
Bobbins.. I ever use plane to work for terrains.. to make cloth... to make a glass window... sometimes i need the glass of a window be with a shape.. not a plane only... and this makeme problems if i think use with VRAY..
IF u say, HEy prodigy.. we cant do nothing because we cant fixit? no problem..
But if you can?? thats a good point to solve on future..
CYA. |
Post by Anunnaki // Aug 23, 2006, 12:45pm
|
Anunnaki
Total Posts: 18
|
Lightwave? Who mentioned Lightwave. The render engine I mentioned is Lightworks in tS which renders the mentioned scene just fine. I'm not sure why you would state a rendering engine is more forgiving. A render engine should be able to handle this scene with ease and with no render errors. If it shouldn't be called a bug then it is a missing feature. With all of the advance features V-Ray is capable of and then it stutters on a simple reflective plane is simply.....silly.
Vincent D. Brumback |
Post by Bobbins // Aug 23, 2006, 7:57pm
|
Bobbins
Total Posts: 506
|
My typo, I did of course mean LightWorks (correct spelling is with a capital W, btw).
The double sided plane issue is more complex than you might think because of overlapping vertexes from the upper and lower surfaces. Rounding errors can mean the vertexes get misplaced slightly, so depending on how the code handles the math for those overlapping vertexes will determine whether the render engine and shader being used will show a problem or not. That's the basis of my statement that some render engines may be more forgiving than others of the problem.
If you want to see a similar, different but related problem then try this in LightWorks:
Create a plane on the ground (Z axis position of zero).
Apply the 3D procedural 'cubes' shader (not the wrapped checker shader).
Render scene
Move the plane up or down a little in the Z axis.
Re-render.
The speckling is due to math errors in determining the 3D position of an infinitely thin object. This is the same concept as the one prodigy is seeing in VRay, but this time in a different context under a different render engine. |
Post by parva // Aug 23, 2006, 10:15pm
|
parva
Total Posts: 822
|
agree with Bobbins and btw. a double sided plane with no depth can cause just trouble. It's the same if you use a double sided plane for clothmotion. If you want to smooth that via a high angle facet you get nice black artefacts.
I recommend to use single sided "planes" for such things like cloth, terrains etc. and "cubes" if the object should get any thickness. I mean in the real world you will never find an object like a double sided zero depth plane ;) |
Post by prodigy // Aug 24, 2006, 9:29am
|
prodigy
Total Posts: 3029
|
Lightwave? Who mentioned Lightwave. The render engine I mentioned is Lightworks in tS Vincent D. Brumback
LOLS.. Sorry for any from Lightworks.. To many light for me today!!:confused: :confused: |
Post by Anunnaki // Aug 24, 2006, 4:26pm
|
Anunnaki
Total Posts: 18
|
"Lightwave (oops, typo - I meant LightWorks of course!) is perhaps more forgiving"
"My typo, I did of course mean LightWorks (correct spelling is with a capital W, btw)"
LightWorks with a capital W, just like LightWave:D
Yes, your example of LightWorks gave me a case of the speckles. However, no speckles in V-Ray.
Vincent D. Brumback |
Post by prodigy // Sep 17, 2006, 6:53pm
|
prodigy
Total Posts: 3029
|
Hi,... I think this is a bug.. because only apear when you add reflectance...
I remeber this like sometime with Ts6.0...
At this moment i made a kitchen.. and i make camera a path from it.. and sometime the path from the camera pass throw a chair with a table.. and the chair and the table whas cut at the middle when the camera stay closed. I send a mail to my contact on caligari team and they ask to caligari support.. and the answer was..
dont pass the camera trow the chair or put more higher and the problem desapear...
I lawgh when i remeber.. because.. is no the problem the move from the camera... the problem whas ts6 .. on ts6.5 whas fixed. (I made the animation on Ts5.1 without any problem..and i dont work with ts6 at ts6.5 upgrade). but i rembeber with humor this answer...
Now i think happend something like my story between betatesters.. say.. yes.. im agree with that.. yup..... No, better you are right... (talking between beta testers)
I think the better answer be.. Dont worry we gonna work on it to solve on future if it is posible....
Cya |
|
