sideshow tpc Posted October 1, 2008 Share Posted October 1, 2008 Hey everyone...been gettin some very useful tips from here for a while now, but now I have a bit of a prob that is kinda stumping me...rendering a scene with big mirror along one wall and for some reason I am getting a weird shadow that only appears in the reflection. You can see it on the wall in the reflection on the left side of the mirror. It isnt static either....it seems to grow as the cam moves around. Would really appreciate any sugestions as to why this might be happening.. Cheers Link to comment Share on other sites More sharing options...
Tommy L Posted October 1, 2008 Share Posted October 1, 2008 what are the render settings? are you using irr map for GI? could be that it needs recalculating. Link to comment Share on other sites More sharing options...
Ky Lane Posted October 1, 2008 Share Posted October 1, 2008 Gday Craig - good to see anohter Brisbanite. Does the shadow occur naturally (as in, turn the camera to the same spot, does it happen?). But like Tom said, might need to up and recalc your irradience map. Link to comment Share on other sites More sharing options...
sideshow tpc Posted October 1, 2008 Author Share Posted October 1, 2008 Hi Tommy, yeah using IRR map and Light cache. have IRR map set to High Animation and Multiframe Incremental. The scenes are rendering pretty quick, so I didnt bother with the every 10th frame thing to save out the file. I had done the save to file thing with the light cache on flythrough mode then set it to 'from file', but it still does it even if I put that back to single frame. Link to comment Share on other sites More sharing options...
sideshow tpc Posted October 1, 2008 Author Share Posted October 1, 2008 Hey Ky, um, if I understand what ya getting at, yeah the shadow kinda builds up as the cam turns around and that corner of the room comes more into the shot. but it doesnt do it evenly, it flickers its way in, but only in the reflection....the wall is smooth as. Link to comment Share on other sites More sharing options...
sideshow tpc Posted October 1, 2008 Author Share Posted October 1, 2008 Oh, and when ya say 'up' the map, do ya mean the HSph. subdivs? Link to comment Share on other sites More sharing options...
Ky Lane Posted October 1, 2008 Share Posted October 1, 2008 Thats what Id do for an experiment - mind posting up screenshot of your settings? Link to comment Share on other sites More sharing options...
LukeC Posted October 1, 2008 Share Posted October 1, 2008 I'm going to take a bit of a punt here and suggest it might be duplicate faces Link to comment Share on other sites More sharing options...
sideshow tpc Posted October 1, 2008 Author Share Posted October 1, 2008 Thats what Id do for an experiment - mind posting up screenshot of your settings? are these all the ones that you would need? Link to comment Share on other sites More sharing options...
sideshow tpc Posted October 1, 2008 Author Share Posted October 1, 2008 Hi Luke, yeah just checked incase I accidently duplicated anything, but all seems good in that respect...the walls are just an extruded spline that I converted to an editable poly then put a shell mod onto..same with the floor, ceiling and mirror, and the mirror is a few millimeters off the back wall....is really stumping me....I even tried uping the subdivs on the mirror material, but that didnt help at all... Link to comment Share on other sites More sharing options...
LukeC Posted October 1, 2008 Share Posted October 1, 2008 So no duplicate faces inside the object? (as apposed to just duplicate objects) does the shadow appear just in the reflection? or does it show if you render from a different view - i.e looking directly at it Link to comment Share on other sites More sharing options...
sideshow tpc Posted October 1, 2008 Author Share Posted October 1, 2008 yeah the shadow only appears in the reflection. when I play the animation, the wall is really smooth, but in the reflection the shadow grows as the cam moves and seems to have a really defined edge to it....the ceiling and the floor slightly intersect the walls, but thats never caused an issue in the past. But now that I think about it, the edges of the mirror do slightly intersect the frame...would that be an issue? Link to comment Share on other sites More sharing options...
tayrona Posted October 1, 2008 Share Posted October 1, 2008 what about the settings of your mirror material??? Link to comment Share on other sites More sharing options...
sideshow tpc Posted October 1, 2008 Author Share Posted October 1, 2008 the mirror is just a standard vraymtrl with the reflective colour set to white. glossyness is 1.0 I have tried the subdivs at 8, 16 and 20 and that didn't seem to change anything....would frensal reflections do anything? or are they not needed for things like flat mirrors? Link to comment Share on other sites More sharing options...
Ky Lane Posted October 1, 2008 Share Posted October 1, 2008 Could also be a real shadow being overemphasised. Tried lighting that corner a little to see what happens? Link to comment Share on other sites More sharing options...
Ky Lane Posted October 1, 2008 Share Posted October 1, 2008 the mirror is just a standard vraymtrl with the reflective colour set to white. glossyness is 1.0 I have tried the subdivs at 8, 16 and 20 and that didn't seem to change anything....would frensal reflections do anything? or are they not needed for things like flat mirrors? Fresnel isnt needed, and make sure your diffuse color is black. Link to comment Share on other sites More sharing options...
sideshow tpc Posted October 1, 2008 Author Share Posted October 1, 2008 I tried doubling the IRRsettings to no avail....so I've just pulled the edges of the mirror back to just inside the frame to see if that helps....think that extra lighting idea might be a good one if this doesnt work.... Is it beer o'clock yet??? Link to comment Share on other sites More sharing options...
Ky Lane Posted October 1, 2008 Share Posted October 1, 2008 Ok, so not settings, needs to be geometry, lighting or materials (or combo). Start breaking it down Looks like a group wii fit room to me. Link to comment Share on other sites More sharing options...
SandmanNinja Posted October 1, 2008 Share Posted October 1, 2008 Stick a person or some gym equipment in front of that part of the mirror! If ya can't fix it, dress it up! Link to comment Share on other sites More sharing options...
Tommy L Posted October 1, 2008 Share Posted October 1, 2008 (edited) check there is no smoothing group applied to the sub-object. Also, the 'every tenth thing' is not just to speed the rendering, it interpolates the lighting solution which gives a smoother result than a frame by frame calculation. Edited October 1, 2008 by Tommy L Link to comment Share on other sites More sharing options...
LukeC Posted October 1, 2008 Share Posted October 1, 2008 that wall is a very simple piece of geom, why don't you just rebuild the wall and see if you still have the problem - trial and error Link to comment Share on other sites More sharing options...
Ky Lane Posted October 1, 2008 Share Posted October 1, 2008 that wall is a very simple piece of geom, why don't you just rebuild the wall and see if you still have the problem - trial and error That was going to be my next suggestion... throw another wall in a foot in from that one and see if it still does it. Even try changing materials. Link to comment Share on other sites More sharing options...
LukeC Posted October 1, 2008 Share Posted October 1, 2008 That was going to be my next suggestion... throw another wall in a foot in from that one and see if it still does it. Even try changing materials. thats a good point - just use a generic light grey as a override material (and exclude the mirror) and see if it still happens - that'll help decide if its geom or material Link to comment Share on other sites More sharing options...
sideshow tpc Posted October 1, 2008 Author Share Posted October 1, 2008 cool...just trying the new wall object thing atm..just a thought, I have the subpixlew sampling thing and clamping one ticke on in colour mapping....would that possibly have an effect? Link to comment Share on other sites More sharing options...
LukeC Posted October 1, 2008 Share Posted October 1, 2008 sub pixel mapping could possibly help - test it. I'm not too sure its a clamping issue, but hey, never hurts to try Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now