Hi,
I'm having problems getting OpenGL lighting to work. Right now I'm
playing with a grid of random
polygons. I've assigned a material that I think should give a light
brown color to everything.
But what I'm seeing is everything is either mostly black or mostly
white most of the time, and there's
a narrow view of angles where I can see shades of my desired color
(and I am getting some correct-looking
shading, so it looks like the normals are at least partly right). If
I had to guess, I'd say that I'm seeing only
a specular component, and no diffuse or ambient - even though I am
setting material only for diffuse and
ambient, and leaving specular at the default.
Here's some relevant bits:
global_ambient = FloatBuffer.allocate(4);
global_ambient.put(0.5f);
global_ambient.put(0.5f);
global_ambient.put(0.5f);
global_ambient.put(1.0f);
position = FloatBuffer.allocate(4);
position.put(10f);
position.put(10f);
position.put(10f);
position.put(1f);
gl.glEnable(GL10.GL_LIGHTING);
gl.glEnable(GL10.GL_LIGHT0);
gl.glLightfv(GL10.GL_LIGHT0,
GL10.GL_AMBIENT_AND_DIFFUSE,
global_ambient);
gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_POSITION,
position);
[ ... ]
float[] mycolor = { 0.8f, 0.7f, 0.6f, 1.0f };
gl.glMaterialfv(GL10.GL_FRONT, GL10.GL_AMBIENT_AND_DIFFUSE,
mycolor,
0);
gl.glVertexPointer(3, GL10.GL_FIXED, 0, mVertexBuffer);
gl.glColorPointer(4, GL10.GL_FIXED, 0, mColorBuffer);
gl.glNormalPointer(GL10.GL_FIXED, 0, mNormalBuffer);
gl.glDrawElements(GL10.GL_TRIANGLES, 6*(GRID-1)*(GRID-1),
GL10.GL_UNSIGNED_SHORT, mIndexBuffer);
Any ideas on what might be wrong? Is there any sample code that
covers this territory?
Incidentally, I couldn't get the FloatBuffer version of glMaterialfv
to work, my code kept crashing.
tom
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