Topic: Modify Opacity of a Material?

[dugk]

Can someone give me some leads on how to modify the Opacity of a Material?

I've already found/created code on verifying a Material exists, creating a Material and applying the Material created.

Thanks!
Doug

[Kerry]

Hello Doug,

I may be able to find some time to look, but I'd need you to post some starter code.

regards
Kerry

[dugk]

Here is what I have for creating the Material and for verifying that it exists or not.

        static string materialName = "Clear";

        static public void createMaterialClear(double mocValue)
        {
            Document acActiveDoc = AcadApp.DocumentManager.MdiActiveDocument;
            Database acCurDb = acActiveDoc.Database;

            Mapper mapper1 = new Mapper(Projection.InheritProjection, Tiling.Tile, Tiling.Tile,
                AutoTransform.TransformObject, Matrix3d.Identity);

            ImageFileTexture mttr = new ImageFileTexture();

            MaterialMap map = new MaterialMap();

            EntityColor eclr = new EntityColor(250, 250, 250);
            MaterialColor mc = new MaterialColor(Method.Override, 1, eclr);
            MaterialDiffuseComponent mdc = new MaterialDiffuseComponent(mc, map);
            MaterialSpecularComponent mck = new MaterialSpecularComponent(mc, map, 1);
            MaterialOpacityComponent moc = new MaterialOpacityComponent(mocValue, map);
            MaterialRefractionComponent mrfr = new MaterialRefractionComponent(1.5, map);

            Material Mat = new Material();

            Mat.Name = materialName;
            Mat.Description = "material";
            Mat.Diffuse = mdc;
            Mat.Specular = mck;
            Mat.Refraction = mrfr;
            Mat.Reflectivity = 1;
            Mat.Reflection = map;
            Mat.Opacity = moc;
            Mat.Ambient = mc;
            Mat.Bump = map;
            Mat.SelfIllumination = 0;
            Mat.Translucence = 0.1;

            ObjectId MatId = ObjectId.Null;
            using (Transaction tr = acActiveDoc.TransactionManager.StartTransaction())
            {
                MatId = ObjectId.Null;
                if (zzExistMaterial(Mat.Name))
                    return;
                else
                {
                    using (DBDictionary dict = (DBDictionary)tr.GetObject
                    (acCurDb.MaterialDictionaryId, OpenMode.ForWrite))
                    {
                        MatId = dict.SetAt(Mat.Name, Mat);
                        tr.AddNewlyCreatedDBObject(Mat, true);
                    }
                    tr.Commit();
                }
            }
        }

        static public bool zzExistMaterial(string matname)
        {
            Document acActiveDoc = AcadApp.DocumentManager.MdiActiveDocument;
            Database acCurDb = acActiveDoc.Database;
            bool doesTheMaterialAlreadyExist = false;
            ObjectId id = ObjectId.Null;
            using (Transaction tr = acActiveDoc.TransactionManager.StartTransaction())
            {
                using (DBDictionary dict = (DBDictionary)tr.GetObject(acCurDb.MaterialDictionaryId, OpenMode.ForRead))
                {
                    if (dict.Contains(matname))
                        id = dict.GetAt(matname);
                    if (id != ObjectId.Null)
                        doesTheMaterialAlreadyExist = true;
                }
                tr.Commit();
            }
            return doesTheMaterialAlreadyExist;
        }

[Kerry]

I don't understand enough about Materials apparently

I fed your beast with this :

Code: [Select]


    [CommandMethod("DoIt")]
    public static void DoMaterialStuff()
    {
        double moc = 80.5;
        createMaterialClear(moc);
    }


The code seems to work, that is ; the Material Mat object in the code editor has the Opacity assigned and the Material is created in AutoCAD
... BUT the opacity stays at 100, not at 80.5 .... ??

Sorry I can't do better at the moment  
Here's my piccys

[Glenn R]

Kerry, as an aside, what add-ons are you running and is it Visual Studio Pro you're running them in or something else? The vertical lines between braces remind me of something...

[Kerry]

Only CodeRush Express
In VS 2008 Pro

http://msdn.microsoft.com/en-us/vcsharp/dd218053.aspx

[Glenn R]

Thought it was....only available for the full biccy though as I understand...new year purchase.

What do you think of Code Rush Express so far?

[Kerry]

Thought it was....only available for the full biccy though as I understand...new year purchase.

What do you think of Code Rush Express so far?

I quite like it :
It's non-intrusive and has some helpfull features

just wish I was coding more to make better use of it.
... perhaps I need to take control of my life again.

[Glenn R]

Visually lining up braces is worth the price of admission alone me thinks, let alone what else it does...

[dugk]

FYI - I did finally figure out what I needed, and learned a bit in the process.

Code:
            using (acActiveDoc.LockDocument())
            {
                using (Transaction tr = acActiveDoc.TransactionManager.StartTransaction())
                {
                    if (thruView.ThruView.zzExistMaterial(materialName) == true)
                    {
                        ObjectId psClearID = thruView.ThruView.zzGetMaterialID(materialName);
                        if (psClearID != null)
                        {
                            Material psClearMat = (Material)tr.GetObject(psClearID, OpenMode.ForWrite);
                            MaterialOpacityComponent moc = thruView.ThruView.createPsClearMaterialMap(Convert.ToInt32(lblValue.Text) / 100.0);
                            psClearMat.Opacity = moc;
                            tr.Commit();
                        }
                    }
                }
            }



        static public ObjectId zzGetMaterialID(string matname)
        {
            Document acActiveDoc = AcadApp.DocumentManager.MdiActiveDocument;
            Database acCurDb = acActiveDoc.Database;
            ObjectId id = ObjectId.Null;
            using (Transaction tr = acActiveDoc.TransactionManager.StartTransaction())
            {
                using (DBDictionary dict = (DBDictionary)tr.GetObject(acCurDb.MaterialDictionaryId, OpenMode.ForRead))
                    if (dict.Contains(matname))
                       id = dict.GetAt(matname);
                tr.Commit();
            }
            return id;
        }

        static public bool zzExistMaterial(string matname)
        {
            Document acActiveDoc = AcadApp.DocumentManager.MdiActiveDocument;
            Database acCurDb = acActiveDoc.Database;
            bool doesTheMaterialAlreadyExist = false;
            ObjectId id = ObjectId.Null;
            using (Transaction tr = acActiveDoc.TransactionManager.StartTransaction())
            {
                using (DBDictionary dict = (DBDictionary)tr.GetObject(acCurDb.MaterialDictionaryId, OpenMode.ForRead))
                {
                    if (dict.Contains(matname))
                        id = dict.GetAt(matname);
                    if (id != ObjectId.Null)
                        doesTheMaterialAlreadyExist = true;
                }
                tr.Commit();
            }
            return doesTheMaterialAlreadyExist;
        }

[Kerry]

great to see a good result Doug.