Forum posts to 'Forums'

Re: Rendering .svg images in Qyoto

Sun, 04 Apr 2010 11:25:30 +0000

Give up, there's nobody else in this forum... I'm waiting for a reply since weeks...

Posted to: Rendering .svg images in Qyoto

Rendering .svg images in Qyoto

Eric Burns — Fri, 19 Mar 2010 16:04:10 +0000

I have an application where I'm using Qt to render .svg images. The problem is that I'm writing in C# and I tried hand-wrapping the functions that I wanted in Qt . . . and it's a mess.

Then I stumbled across Qyoto, and my excitement level immediately rose. This can be the solution to all my problems!

I tried repeating what I did on the C++ side using Qyoto, but a couple things seem to be missing that have hobbled me. Could someone give me some pointers of how to do what I want to in Qyoto?

I have two issues:

1) I want to load a QSvgRenderer with an .svg String (not from a file because I alter the .svg dynamically every frame). This is how I did that in C++:

QSvgRenderer renderer = new QSvgRenderer();
QString qSvgString = QString( svgString );
QXmlStreamReader *xmlReader = new QXmlStreamReader( qSvgString );
bool success = renderer.load( xmlReader );

However, in Qyoto, there is no Load method that takes a

QXmlStreamReader

, so I tried this instead:

QByteArray byteArray = new QByteArray( svgString );
String debugString = byteArray.ConstData();
bool success = renderer.Load( byteArray );

The debugString comes back as the .svg text that I would expect, but the Load always fails. The svgString is the same as in the C++ example, so I'm sure that's right, unless this Load method is expecting some processed data instead of the straight .svg?

2) I want to take the results and put it in a bitmap. This is how I did it on the C++ side:

pixmap = new QPixmap( renderer.defaultSize() );
QPainter *painter = new QPainter( pixmap );
renderer.render( painter );
HBITMAP bitmapPtr = pixmap ->toWinHBITMAP();

But in Qyoto there is no toWinHBITMAP method. How would I get the contents into a Bitmap in Qyoto?

Thanks for your help! You guys rock!

Posted to: Rendering .svg images in Qyoto

Re: how to get actors

Mon, 01 Mar 2010 21:29:46 +0000

very well visited forum, i see...

Posted to: how to get actors

how to get actors

Thu, 25 Feb 2010 20:20:13 +0000

Hi,

i'm trying to create a game with XNA and PhysX-sharp.

My problem is: actors are always null.

the scene itself is initialized correctly (i guess so, there were no errors), but i can't create actors with scene.createActor(actordescription), it always returns null. actordescription.IsValid returns true.

I'm using XNA 3.1 (doesn't matter, or does it?), PhysX-Sharp 0.9.3, got the latest PhysX-Driver and PhysX-SDK 2.8.1.

Hope anybody can help.

Code:

 
//global
Nx.scene
 
//initialize
Nx.NxPhysicsSDKDesc sdkdesc = new Nx.NxPhysicsSDKDesc();
Nx.NxSDKCreateError err = Nx.NxSDKCreateError.NXCE_NO_ERROR;
 
sdk = Nx.PhysXLoader.NxCreatePhysicsSDK(Nx.PhysXLoader.NX_PHYSICS_SDK_VERSION, sdkdesc, ref err);
Nx.NxSceneDesc sceneDesc = new Nx.NxSceneDesc();
 
scene = sdk.createScene(sceneDesc);
 
 
 
//procedure: NxActor CreateBox(Matrix world, Vector3 dim, float mass)
Nx.NxBoxShapeDesc boxDesc = new Nx.NxBoxShapeDesc();
 
boxDesc.dimensions = swapper.CreateNxVector(dim); //swapper is a little swapper for XNA-Vectors and matrices and physx
 
Nx.NxActorDesc actorDesc = new Nx.NxActorDesc();
Nx.NxBodyDesc bodyDesc = new Nx.NxBodyDesc();
 
 
bodyDesc.mass = mass;
 
actorDesc.body = bodyDesc;
actorDesc.density = 10.0f;
 
actorDesc.globalPose = swapper.CreateNxMat34(world);
 
actorDesc.shapes.pushBack(boxDesc);
 
if (!actorDesc.isValid())
  throw new Exception("Invalid Box"); //never thrown
 
return scene.createActor(actorDesc);

Posted to: how to get actors

integrate physx sharp

v b — Wed, 07 Oct 2009 01:29:43 +0000

In my current game, the way it works is the C++ engine is called through a csharp wrapper that is used for gameplay scripts and all physics etc is done in c++ engine itself. Can i some how reference the physx sharp binaries and use the physics API?

Posted to: integrate physx sharp

how to setUserContactReport() ?

Sun, 20 Sep 2009 10:04:47 +0000

Basing on a sample provided in the PhysX SDK I've been trying to make the physics system notify me when a collision of two specified objects takes place. Simple scene test looks like this (last lines are essential):

 
        public override void CreateScene()
        {
            physicsSpace = new PhysicsSpace();
 
            Matrix transform = Matrix.Identity;
            Matrix box_transform = Matrix.RotationX(3.1415f / 4) * Matrix.Translation(0, 9.81f, 0);
 
            NxPlaneShapeDesc planedesc = new NxPlaneShapeDesc();
            planedesc.normal = Utils.vec3(0, 1, 0);
            planedesc.d = 0;
 
            plane = physicsSpace.CreateStatic(planedesc, ref transform);
 
            NxBoxShapeDesc boxdesc = new NxBoxShapeDesc();
            boxdesc.dimensions = Utils.vec3(2,2,2);
 
            box = physicsSpace.CreateDynamic(boxdesc, ref box_transform, 10);
 
 
 
            physicsSpace.Scene.setUserContactReport(new ContactReport());
            physicsSpace.Scene.setActorPairFlags(plane, box, (uint)NxContactPairFlag.NX_NOTIFY_ON_TOUCH);
 
        }

Last two function calls are taken directly from the sdk sample. ContactReport is a class overriding onContactNotify function. But before it's called, following error occurs when the collision takes places:

System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.\r\n at PhysX_sharp.NxScene.NxScene_fetchResults_1_INVOKE(HandleRef classPointer, Boolean call_explicit, NxSimulationStatus status, Boolean block)\r\n at PhysX_sharp.NxScene.fetchResults(NxSimulationStatus status, Boolean block)\r\n ........

If there's no userContactReport or NX_NOTIFY is set to ignore nothing wrong happens. It seems that there's a problem with passing a managed c# instance to unmanaged code. My question is how should I use this feature? Is there an alternative?

Posted to: how to setUserContactReport() ?

Re: Correct way of setting arrays for triangle mesh

Ilmar Kruis — Sun, 01 Feb 2009 21:38:09 +0000

I haven't done much with mesh cooking myself so far, but a few things I can come up with are:

Do you initialise the cooking sdk?
What does meshDesc.isValid() return?
NxStream is, afaik, just an abstract class which need an implementation.

Posted to: Correct way of setting arrays for triangle mesh

Re: Correct way of setting arrays for triangle mesh

Anders Malmgren — Sat, 31 Jan 2009 15:21:34 +0000

This is my code, coocked returns false, and it crashes on last line

 
NxTriangleMesh mesh = sdk.createTriangleMesh(stream);
 
        private NxActor CreateActorFromFile(string filename)
        {
            MeshManager meshManager = new MeshManager();
            NxActor actor = null;
            NxVec3[] vertices;
            int[,] indices;
 
            meshManager.GetMesh(filename, out vertices, out indices);
 
            // create stream
            NxStream stream = new NxStream();
            NxTriangleMeshDesc meshDesc = new NxTriangleMeshDesc();
            // go unsafe
            unsafe
            {
                // fix pointers
                fixed (int* pIndices = indices)
                fixed (NxVec3* pVertices = vertices)
                {
                    // assign pointers
                    meshDesc.triangles = new IntPtr((void*)pIndices);
                    meshDesc.points = new IntPtr((void*)pVertices);
 
                    meshDesc.pointStrideBytes = (uint)sizeof(NxVec3);
 
                    meshDesc.numVertices = (uint)vertices.Length;
                    meshDesc.numTriangles = (uint)indices.Length / 3;
                    meshDesc.triangleStrideBytes = 3 * sizeof(int);
                    meshDesc.flags = 0;
                    meshDesc.heightFieldVerticalAxis = NxHeightFieldAxis.NX_Z;
                    meshDesc.heightFieldVerticalExtent = -1000.0f;
 
                    // create mesh
                    NxCookingInterface cooking = PhysXLoader.NxGetCookingLib(PhysXLoader.NX_PHYSICS_SDK_VERSION);
                    bool cooked = cooking.NxCookTriangleMesh(meshDesc, stream);
                }
            }
 
            NxTriangleMesh mesh = sdk.createTriangleMesh(stream);
 
 
 
            return actor;
        }

Posted to: Correct way of setting arrays for triangle mesh

Correct way of setting arrays for triangle mesh

Anders Malmgren — Sat, 31 Jan 2009 12:58:10 +0000

Hi.
I've written a parser for .x directx files that will create a NxVec3 array of vertices and a uint32 array size of (x, 3) of indicies.

But the properties only takes pointers, whats the correct way of settings these two properties?

Best Regards, Anders

Posted to: Correct way of setting arrays for triangle mesh

Re: Scene::createJoint() problem

Sun, 21 Dec 2008 12:41:07 +0000

Thanks. Now it works

Posted to: Scene::createJoint() problem