Forum: Bryce


Subject: PROOF That B5 Has TRUE Radiosity

JDWohlever opened this issue on Feb 08, 2003 ยท 34 posts


JDWohlever posted Sat, 08 February 2003 at 11:35 PM

Ok, Your looking at the image and "say so what?". Here is the interesting part. WHat if I told you that was done with one light? Still not impressed? Ok, what if I told you soft shadows where NOT on on the light? Still not? Ok what if I told you that... No Lights where shining on the truck or ground. All light is coming from a REFLECTION. And NOT a reflection from a mirrored/reflective object either! Do I have your attention now? Good :) Let me explain. It is a infinite plane above the camera, painted pure 100 diffuse white with a Quad or directional light shining upward on the plane only. I then increased the power of the light, render in high end mode, and this is the results. Want the secret? Send $19.95 .... hehehe Just kidding.. The SECRET is 1 ambiant setting and a 0.1 reflection Huh? When using this method, to get true radiosity make sure all objects you want to recieve radiosity have at least a 1 ambiant setting and a 0.1 reflection setting. And that you render in high end mode (the word eludes me right now for some reason). If you knock the ambiant setting down to say 0.5 it will still render, but like in the real world the objects color will get darker. Adjusting the SIZE of the Directional or spotlight shining on the plan above determines the area covered. If you do not want to use an infinite plane (Say its an outdoor render, then the size of the plane you use along with the size of the light will determine the area covered. If you think the light is just "fall-off" from the directional light your wrong. Try removing the plane and keeping the light. You won't get the effect anymore.. Because its true light bouncing. Pros: ---------------------- 1) True Lighting, as close to real as you can get in Bryce 2) Only requires one light ..ie, no more light domes Materials seem to reflect and act like there descriptions. (Look at gunmetal color of truck body and look where blue color shifts with light.) 3)Opens a big door for all kinds of Special FX. 4)Soft Shadows are automaticly done by the variance in the lighting it self. Cons: ---------------------- 1) Long Render Time. You have to use the highest render setting. For this render I did the 256 rays option, however, that is not neccesary. 64 rays or more and everything except DOF are required (You can still do DOF, its just not required) 2) The Nano Render window shows almost completely black preview. This is becuase the nano preview does not use true ambiance or radiosity.So dont rely too much on what is showing, becuase once you render you will see a difference. 3) You have to find a way to hide the "plane" above the objects so that it doesn't show up in the render. Not too difficult. In the next message I will attach the scene, (Minus the truck, sorry). Just render the scene, all the options "should" already be set. Oh, one more thing, The "square edges" around the wheel wells are not Bryce or the rendering process fault. That is a problem in the actual 3d mesh itself so don't worry about that. Please let me know what you think. If this is something that someone else has already made known, I apologize. I did search through the forums and only saw renfrences to using light domes. All I'm trying to do is help, nothing more,nothing less.