Re: ShadedMaterials not working with Collada model

Hi Andy,

yes I've tried using my shadedMaterial first, e.g.
mat.addMaterial(shadedMaterial,    "material0");

see here for the result:
http://www.danwashere.com/dev/papervision/shadedtextures_and_collada_problem/ShadingTest.2.html

And I've now traced out the materialsList() for the object, just before it gets changed in the mouse click handler, and it throws an null object error:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at org.papervision3d.objects::DisplayObject3D/materialsList()
    at ShadingTest/handleMouseClick()

So I guess it's as you say - it loses the materials list. Is there a work around for this you know of?

Cheers,
Dan

andysk8er wrote:

Hi Dan,
A few questions:
Have you tried adding the ShadedMAterial to the model first (instead of the
FlatShadeMaterial)? Does that fail?

You say that you have tried doing replaceMAterialByName with another
FlatShadeMAterial, but it failed. Have you tried tracing the model's
materialsList each time you click to make sure that the material reference
is still there? It may be a bug in the Collada class. 

-Andy


DanSearle wrote:
  

Hi Andy thanks for your reply. I've simplified the code and the model, 
but still I can't get it to work.

I have two problems:

   1. I can't get ShadedMaterials working with my Collada object.
   2. replaceMaterialByName is also not working with the Collada object.

See here:
http://www.danwashere.com/dev/papervision/shadedtextures_and_collada_problem/ShadingTest.html
Click anywhere to make it swap the materials (it also moves the object 
left and right so you know your click has worked) - it fails to swap the 
materials.

Here's the cut down code:

package {
   
// imports not included
   
    public class PV3DTest extends MovieClip {
       
        private var mc:MovieClip;
       
        private var basicView:BasicView;
       
        private var light:PointLight3D;
       
        private var testColladaObject:Collada;
        private var showingShadedMaterial:Boolean;
       
        private var flatShadeMaterial:FlatShadeMaterial;
        private var movieMaterial:MovieMaterial;
        private var shadedMaterial:ShadedMaterial;
       
        public function PV3DTest($mc:MovieClip) {
           
            mc = $mc;
           
            // Set up of BasicView and Light not included
           
            // Note: Texture_extra_1 is a library clip.
            movieMaterial = new MovieMaterial(new Texture_extra_1(), 
false, true, false);

            shadedMaterial = new ShadedMaterial(movieMaterial, new 
FlatShader(light, 0xFFFFFF, 0x555555));
           
            flatShadeMaterial = new FlatShadeMaterial(light, 0x8888ff, 
0x111133);
           
            var mat:MaterialsList = new MaterialsList();
            // Initially use the flatShadeMaterial, which works ok.
            mat.addMaterial(flatShadeMaterial,    "material0");
            testColladaObject = new Collada("Simple.dae", mat, 0.00005);
            basicView.scene.addChild(testColladaObject);
            testColladaObject.x = -100;
           
            showingShadedMaterial = false;
           
            mc.stage.addEventListener(Event.ENTER_FRAME,
handleEnterFrame);
            mc.stage.addEventListener(MouseEvent.CLICK, handleMouseClick);
        }
       
        private function handleMouseClick($e:MouseEvent):void {
            // Toggle the material on mouse click.
            if (showingShadedMaterial) {
                // replaceMaterialByName seems to do nothing
                
testColladaObject.replaceMaterialByName(flatShadeMaterial, "material0");
                testColladaObject.x = -100;
                showingShadedMaterial = false;
            } else {
                // I also tested this by swapping one flatShadeMaterial
for
                // another of a diff colour, that didn't work either.
                testColladaObject.replaceMaterialByName(shadedMaterial, 
"material0");
                testColladaObject.x = 100;
                showingShadedMaterial = true;
            }
        }

        private function handleEnterFrame($e:Event):void {           
            // Spin the object by mouse position
           
            basicView.singleRender();           
        }       
    }   
}

Are these known bugs in revision 918 maybe? I'm not sure where to look 
to find that out.

Or is it a problem in my Collada DAE file perhaps?
http://www.danwashere.com/dev/papervision/shadedtextures_and_collada_problem/Simple.dae

Thanks,
Dan


andysk8er wrote:
    

Hi Dan,

Why don't you try to simplify things in your code first. Simply create a
simple flatshadedmaterial, add it to the materials list and do your
replaceMaterialByName. See if you can get that working. Then, go back and
add in your textures, shaders, etc...

I guess I'm not really sure why you are declaring your materials as
Classes.
Why not just create MovieAssetMaterials using the linkage name in the
library? Anyway, if you strip all of that stuff out of your code and
simply
use a flatshaded material, you can see if that works. If so, you can
begin
adding your materials back in until it breaks. 

-Andy



DanSearle wrote:
  
      

Hi list,

If I understand SVN right I'm on revision 918.

I'm using the free version of Google SketchUp (v6.4.112) to make DAE 
files (using that hack to get the DAE from the KMZ it outputs), but I 
can't get the ShadedMaterials to work with it.

Here's a demo I've made:
http://www.danwashere.com/dev/papervision/shadedtextures_and_collada_problem/DanWasHereWorld.html
(Mouse Up/Down to move in and out, Mouse Left/Right to move the light 
source)

The paddling pool is meant to be shaded - the cube uses the same shaded 
materials as the pool to prove that the materials themselves are ok.

Is it maybe that the DAE created in this way isn't compatible with 
ShadedMaterials? Here's a link to the DAE file:
http://www.danwashere.com/dev/papervision/shadedtextures_and_collada_problem/paddling%20pond.dae

Or in case it's a code problem, here's the relevant code, or you can 
also get the AS file here:
http://www.danwashere.com/dev/papervision/shadedtextures_and_collada_problem/DanWasHereWorld.as

(Note that I have the textures in the FLA library)

*** I've cut the code from this reply cos it wasn't useful ***

I'd love an explanation of how to do this if someone can help?

Many thanks,
Dan



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