| 00:00.29 | apeman1 | TD-Linux: its off. I tried turning diffuse off for good measure as well |
| 00:00.37 | apeman1 | oops |
| 00:00.38 | apeman1 | not diffuse |
| 00:00.49 | apeman1 | i tried changing those 0 0 0 1's to 0 0 0 0 |
| 00:00.59 | apeman1 | no difference, and they shouldnt make a difference. |
| 00:03.14 | TD-Linux | yeah that's weird then. I guess that *can* happen with the opengl fixed shader model. |
| 00:03.20 | TD-Linux | depends on what bzflag's lights are. |
| 00:12.40 | blast007 | I think we use candles |
| 00:16.44 | JeffM | our light is not white |
| 00:16.48 | JeffM | it's yellow during the day |
| 00:17.01 | JeffM | so it may get close to white |
| 00:17.07 | JeffM | when it all adds up |
| 00:17.34 | JeffM | does it go white during a full moon? I belive that light is more blue |
| 00:19.19 | JeffM | and difuse is the base color of the material :) |
| 00:19.29 | JeffM | so making that 0 shoudl make the material black |
| 00:20.48 | apeman1 | it goes white when the moon is up and opposite to the face where there would be strong specular reflection |
| 00:21.25 | JeffM | then that's just what basic GL does |
| 00:21.30 | JeffM | we don't do anything fancy |
| 00:21.36 | JeffM | just set the gl variables |
| 00:21.44 | JeffM | no shaders or anything |
| 00:21.54 | JeffM | and we are in a stnadard blend mode |
| 00:22.19 | JeffM | 1 minus alpha IIRC |
| 00:22.47 | JeffM | but for shure it's not supposed to be any kind of realistic lighting simulation :) |
| 00:22.54 | JeffM | emmision doesn't add light back into the world :) |
| 00:23.34 | apeman1 | ok i set color black and emission light blue, now theres no specular reflection. Thats what i wanted, i just naively assumed color was the main thing to control |
| 00:24.00 | JeffM | emmision just ADDs color to the texture |
| 00:24.20 | apeman1 | i didnt have a texture this time |
| 00:24.26 | JeffM | diffue changes the color of the texel based on the angle between the normal and the light |
| 00:24.30 | JeffM | doesn' matter |
| 00:24.38 | JeffM | there is always a pixel drawn |
| 00:25.14 | JeffM | if no texture it starts out as white, gets multiplied by the difuse, then ambient and emmision are added IIRC |
| 00:25.35 | JeffM | then specular is computed based on he angle betwen the light, the surface and the camera |
| 00:26.01 | JeffM | but the exact math will depend on your GL implementaiton |
| 00:26.10 | JeffM | it's all supposed to give the same image on every card tho |
| 00:27.24 | apeman1 | color is the same as diffuse. But what i'm seeing is that "diffuse" is specular not diffuse. |
| 00:28.26 | JeffM | yes we implmeent "color" as the diffuse chanel |
| 00:28.58 | JeffM | if you just define color, we don't turn on specular IIRC |
| 00:29.01 | JeffM | specular is "Shine" |
| 00:30.08 | JeffM | openGL has 2 modes, 1 is "Color mateial" that is where you just define a color and it gets mapped to diffuse. THe other is a full material definition wtih Ambient, Diffuse, Specular, and Emmision |
| 00:30.37 | JeffM | anyhing else involves fancy new fangled openGL 1.2 stuf |
| 00:31.26 | JeffM | we don't go into that swanky 1998 technology! |
| 00:32.18 | apeman1 | what i had was ambient black, diffuse light blue, specular black. I don't think it's openGL's default or otherwise behavior that a light blue material can possibly look white under those settings |
| 00:32.50 | apeman1 | maximum light should just make it look light blue |
| 00:34.33 | apeman1 | i checked with another color to make sure it wasnt just me failing to tell light blue from white |
| 00:34.49 | TD-Linux | apeman1, are you using the brightness slider on bzflag? |
| 00:35.03 | apeman1 | the -/+ thing |
| 00:35.06 | apeman1 | yes |
| 00:35.31 | TD-Linux | that would actually cause this issue if it's cranked up a lot. see if turning it down fixes it |
| 00:36.34 | apeman1 | oh that brightness thing. I turned it to lowest and it still goes white |
| 00:36.41 | TD-Linux | also I think you can actually saturate a material color in opengl 1.1 with multiple lights |
| 00:36.45 | TD-Linux | or with a light brightness above 1 |
| 00:37.34 | TD-Linux | the light equation is sum(dot(normal,lightnormal)*color) |
| 00:37.42 | TD-Linux | for diffuse in opengl 1.1 |
| 00:37.52 | TD-Linux | err I meant * lightcolor in there |
| 00:38.21 | TD-Linux | so I don't know if the light color is allowed to be above (1, 1, 1), but you can have up to 8 lights so you could exceed 1 |
| 00:39.52 | apeman1 | Is there any significance to having textures that are 256x256, in terms of how they map by default to boxes of a certain dimension? |
| 00:40.32 | apeman1 | it looks like they map to 8 units if you don't specify scale |
| 00:54.46 | JeffM | apeman1, you forget that the light color gets added in |
| 00:54.51 | JeffM | and then we gamma the thing |
| 00:55.09 | JeffM | but maybe your video card has a bug, who knows |
| 00:55.21 | JeffM | we don't do any trickery with the lighting on our end |
| 00:55.30 | JeffM | at least when there isn't a shot near it |
| 00:55.46 | JeffM | we do wierd vertex color stuff to do the shot glow |
| 00:57.07 | TD-Linux | which could be done with a shader but that'd be too 2002 |
| 00:57.26 | TD-Linux | apeman1, I don't think the texture res affects the default mapping at all. |
| 00:57.32 | TD-Linux | not that you should ever really use the default mapping |
| 00:58.01 | JeffM | ohh yeah lots of stuff could be done with shaders |
| 00:58.20 | JeffM | but then bzflag would not run on an old SGI |
| 00:58.53 | TD-Linux | I don't think graphics are really much of an adoption problem with bzflag at this point. It looks fine. |
| 00:59.37 | TD-Linux | that said I'd really love multitexturing or custom vertex colors so I can bake lighting :) |
| 00:59.38 | JeffM | yeah we can kinda assume hardware GL these days |
| 00:59.48 | JeffM | I mean at LEAST a Voodoo 2 or something |
| 01:00.07 | JeffM | baked lighting won't work with our dynamic sky :) |
| 01:00.15 | TD-Linux | I would lock it on the server. |
| 01:00.24 | JeffM | yeah |
| 01:00.41 | TD-Linux | I don't really know if I'd like the aesthetics with brightly colored tanks though. |
| 01:00.59 | TD-Linux | I think maybe a toon shader and edge stroking would actually look nicer. |
| 01:01.05 | JeffM | heh |
| 01:03.44 | blast007 | JeffM: we probably haven't worked on old SGIs in a while |
| 01:04.26 | blast007 | imagines there'd be some issues building now |
| 01:04.44 | JeffM | probabbly |
| 01:06.42 | JeffM | imagine if we had real shadows :), http://forums.bzflag.org/download/file.php?avatar=48_1401652946.gif |
| 03:31.30 | khonkhortisan | An ST coming around a corner would be creepier with a shadow on the far wall |
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| 10:40.57 | blast007 | khonkhortisan: an AT-ST coming around the corner would be even better |
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