Thank you both very much for your suggestions and help. I went through this tutorial: http://code.google.com/p/android-gl/downloads/detail?name=AndroidGL-0.4.zip&can=2&q=
And it seems my problem has been enabling GL_COLOR_MATERIAL. I had enabled this because I was using textures at one point, but apparently this interferes with materialfv. I suppose I need to enable it just for the triangles that use a texture, draw them, then disable it so it doesn't interfere with the other non-textured triangles. I guess I'll be back when that doesn't work :). Cheers, David On Jul 23, 9:47 am, Indicator Veritatis <[email protected]> wrote: > And having reviewed ch. 5 myself, I see you did remember to set and > use the normals after all. Good! But two things stand out: > > 1) your emissivity values are the default, so you should be able to > omit that call completely > 2) your R, G, & B values (for the material) are all quite close to > each other. No wonder it looks gray. Try using an R value about half G > and B and you should see a genuine color. > > On Jul 22, 12:13 pm, Indicator Veritatis <[email protected]> wrote: > > > > > I don't know the complete answer to your predicament off the top of my > > head, but it sounds like you are leaving out some steps for deciding > > the final color: a review of the famous "Red Book", chapter 4 & 5, the > > latter of which makes the highly relevant observation, "Part of this > > computation [final pixel color] depends on what lighting is used in > > the scene and on how objects in the scene reflect or absorb that > > light" > > > Note the word 'part'; it takes more than just the combination of > > Lightfy and Materialfy to set the final color. > > > The Red Book is athttp://www.glprogramming.com/red/. I know the > > edition is quite old, but it turns out to be quite up to date for the > > version of Open GL (1.3) assumed by OpenGL ES 1.x. > > > On Jul 22, 1:16 am, dsl <[email protected]> wrote: > > > > Thanks for the link. > > > > I've used glColorf and that seems to work, but it was my understanding > > > that a combination of glLightfv and glMaterialfv would also set the > > > color. > > > > Cheers, > > > David > > > > On Jul 21, 5:53 pm, jojoma <[email protected]> wrote: > > > > > I don't know much of OpenGL too, but I think your triangle is getting > > > > the color gray because it has no color itself, and your lights are > > > > gray. > > > > > check this tutorial, might help you get some > > > > pointers:http://blog.jayway.com/2010/01/14/opengl-es-tutorial-for-android-%E2%... > > > > > On Jul 21, 12:55 am, dsl <[email protected]> wrote: > > > > > > Hello all, > > > > > > I'm fairly new to OpenGL ES and am having a heck of a time trying to > > > > > get my material to show up. Right now all I'm looking at is a shaded > > > > > gray rotating triangle. At least it looks shaded (light and dark > > > > > parts), but now color other than gray. > > > > > > I've posted my code here: > > > > > > The triangle coordinates, normals, and > > > > > material:http://code.google.com/p/davidslamb/downloads/detail?name=Manual.java > > > > > > The > > > > > renderer:http://code.google.com/p/davidslamb/downloads/detail?name=regularRend... > > > > > > I'm using ambient, diffuse, and emission to create the material. And > > > > > ambient and diffuse for the light. > > > > > > I'm testing on a G1 running Android 1.6. > > > > > > Any insight will be helpful. > > > > > > Cheers, > > > > > David -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
