i think using an empty world to reset fov is good enough. just that more operations are done than simply changing the frustum. if cpu speed is high enough, it's ok.

my desktop app has noticeable specular effect.
my desktop app uses hardware GL, so max lightmul is 1 , right?
i didn't set lightmul in it.

this is test code, you'll see a white square on top left corner and it moves a little.
if your screen has high resolution, maybe it's less noticeable, test screen is 1024x600.

package abc.def;
import com.threed.jpct.*;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.egl.EGLDisplay;
import javax.microedition.khronos.opengles.GL10;
import android.opengl.GLSurfaceView;
import android.os.Bundle;
import android.app.Activity;

public class Sim extends Activity {
   static GLSurfaceView GLview;
   static MyRenderer renderer;
   static FrameBuffer fb;
   static World world=new World();
   static Camera cam=world.getCamera();
   static Texture tex;
   static float fov=0.1f;

   protected void onCreate(Bundle a) {
      super.onCreate(a);
      renderer=new MyRenderer();
      GLview=new GLSurfaceView(getApplication());
      GLview.setEGLContextClientVersion(2);
      GLview.setRenderer(renderer);
      setContentView(GLview); }
   @Override
   protected void onPause() { super.onPause(); GLview.onPause(); }
   @Override
   protected void onResume() { super.onResume(); GLview.onResume(); }
   @Override
   protected void onStop() { super.onStop(); }

   class MyRenderer implements GLSurfaceView.Renderer {
      public void onSurfaceCreated(GL10 g,EGLConfig c) {}
      public void onSurfaceChanged(GL10 g,int w,int h) {
         if (fb!=null) fb.dispose();
         fb=new FrameBuffer(w,h);
         cam.setFOVLimits(0.0001f,10f);
         cam.setClippingPlanes(0.1f,100f);
         tex=new Texture(1,1,new RGBColor(200,200,200));
         TextureManager.getInstance().addTexture("tex",tex);
      }
      public void onDrawFrame(GL10 g) {
         fb.clear(); cam.setFOV(fov);
         fov-=0.001f; if (fov<0.01) fov=0.1f;
         world.renderScene(fb); world.draw(fb);
         fb.blit(tex,0,0,10,10,0,0,80,80,-1,false);
         fb.display(); }
   }
}

great! thanks!
will you fix it based on the version with correct camera nearclip/farclip/fov settings?

i have a JPCT app ported to JPCT-AE. i see a grey object with default shader has color problem. its faces are either grey or total black according to light direction, look like very much overbrighted.
my device has PowerVR540 GPU and Android 4.2.2.
what could be the cause?

i am trying to make fake shadow. my approach is like this:
stick a transparent mesh on an object3D which should be a shadow receiver, but in fact the transparent mesh is the receiver;
render the shadow caster object into a texture and project the texture onto the transparent mesh;
the RTT should have alpha information - the part covered by shadow caster is opaque and black, other part is fully transparent.

now i wonder how to render into the alpha channel of RTT texture - i want to use openGL hardware framebuffer for the RTT task (faster) so the texture should be directly used in GPU (not downloaded for further process).
is setAsShadowMap() meant for this?

some parts of my scene are rendered with shader while some are not.
i need to know the formula of fog in GL's fixed function rendering and use it in shader so that all parts in the scene have the same fog effect.
i use these settings on the parts without shader:
setFogging(1);
setFoggingMode(1);
setFogParameter(100f,20000f, r,g,b)