matt_vinoir Posted August 13, 2002 Share Posted August 13, 2002 with exterior scenes. the background image alone won't reflect in glass. I heard about skydomes but don'r know what they are. I put a massive spher over the model and flipped the normals. I had to not use radiosity on the sphere as it crahed but imagine is blechs it out too. It sort of works. THe sky is very dark though. I use self illuminate but i feel i'm going aboutthisin a funny way. Whats the best and simplist way to do this? Link to comment Share on other sites More sharing options...
trey Posted August 13, 2002 Share Posted August 13, 2002 i've got the same problem. i'm using the IES system to light my exterior. the image is an interior room looking out. do i use the skydome as my skylight? how do i light the skydome to reflect back at the model? if the skydome is my skylight, do i need to turn off the skylight in the IES system? advice is appreciated Link to comment Share on other sites More sharing options...
STRAT Posted August 13, 2002 Share Posted August 13, 2002 not using viz 4 for radiosity, i wonder if it's similar to the method used in Cinema4D? i use a skyobject or skydome with a nice strong sky map on it and make it not visible to the camera. in this state it doesn't render because it's invisible to the camera, but it does still effect the radiosity, so image based lighting from it can be used. i then just use a normal environmental image for the backround which doesn't effect radiosity. Link to comment Share on other sites More sharing options...
matt_vinoir Posted August 14, 2002 Author Share Posted August 14, 2002 nisus uses viz 4 doesn't he. oi nisus give us a hand mate! How do you get sky reflections in windows for external scenes nisus? Link to comment Share on other sites More sharing options...
Ismael Posted August 14, 2002 Share Posted August 14, 2002 VIZ4 uses the diffuse color for the reflectance of a material. Usually for clear glass the diffuse, ambient, reflect color swatches are set to black. Black is transparent... Adjust the reflect color swatch until you get the right reflection of the environment map. Chico Link to comment Share on other sites More sharing options...
nisus Posted August 14, 2002 Share Posted August 14, 2002 Hi all, To be honest I'm more a max3.1-man than viz4-oriented, because I could not get exteriors right in viz. Interiors are fine, but exteriors are hell: the sky always seems blown out, my multiple skydomes just don't seem to work. The results are catastrophical and don't seem logically at all... So my only tip is not to use viz4 for exteriors... rgds nisus Link to comment Share on other sites More sharing options...
matt_vinoir Posted August 14, 2002 Author Share Posted August 14, 2002 oh, well i'm not finding too difficlut to achieve nice exterior results, i just can't get any reflection from the background enirvoment image in my glass thats all. i'm considering vray for my exteriors, is this easier? Link to comment Share on other sites More sharing options...
Vince Paske Posted August 14, 2002 Share Posted August 14, 2002 You can try mapping a bitmap to the diffuse channel of your glass to fake the reflections. Link to comment Share on other sites More sharing options...
Frank Posted August 14, 2002 Share Posted August 14, 2002 Hi, You could also try putting the sky map in the envirement(spelling) map slot of the raytrace material your using for the glass. Link to comment Share on other sites More sharing options...
Spongebob Posted August 23, 2002 Share Posted August 23, 2002 Matt, I am in the process of doing a side-job in VIZ 4, and after seeing your post I decided it was time for me to get a skydome nailed down. I have one placed and it seems to work well. It is my first truly sucessful attempt (that wasn't by accident) The skydome does need to be lit by its own exclusive omni. Simply exclude all other objects from the light source to not invade your scene. And dont worry about having to turn off radiosity for the dome because it is required. ...unless of course you want the entire scene washed over with blue from the sky. Turn off radiosity for the grass as well or it will do the same. Let me know if it helps - and if you have another question. Good luck, Spongebob Detroit, MI Link to comment Share on other sites More sharing options...
NenadK Posted August 24, 2002 Share Posted August 24, 2002 hi matt i guess you've already done that, but if you didn't - after processing radiosity in VIZ4 you must adjust the environment setup correctly : a quick rule of the thumb is to check in daylight and exterior, AND set Physical Scale to the value of your strongest light. Physical scale is used for all reflection/ refraction calculations (and the calc of the non-physical lights), so it needs to be set up correctly - for instance, for bright sunlight it could go up to 80,000lx (as bright as the sun). If it still doesn't show (and it should have been), either try to light up the skydome only, OR use diffuse map in self-illumination spot. Also, I guess you wouldn't need to use the skydome, as it should also reflect the background image (please make sure you've checked "Process Background and Environment Maps" also). Good luck Link to comment Share on other sites More sharing options...
matt_vinoir Posted August 24, 2002 Author Share Posted August 24, 2002 Thanks for your help guys, it was the physical scale, just had to wack it really high to match the daylight. Spongebob, one question about the skydome, can you get a skydome of part sky part land? My vr's are an obvious example of where a standard bitmap doen't work too well, thanks Link to comment Share on other sites More sharing options...
Spongebob Posted August 24, 2002 Share Posted August 24, 2002 Are you referring to a bitmat of the horizon? I dont' see why not. Just apply the map to the dome and adjust the UVW map's gizmo until it is in the right place. Spongebob Detroit, MI Link to comment Share on other sites More sharing options...
matt_vinoir Posted August 27, 2002 Author Share Posted August 27, 2002 i found what i was looking for i expect you have heard of it but it has some great 360 skies with ground aswell. http://www.1000skies.com Link to comment Share on other sites More sharing options...
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