Collision Detection example conversion....

[Guest]

Hello all,

I'm converting the collision detection example to c#, however, when I try to add the OctTree node I get the following error:

No overload for method 'AddOctTreeSceneNode' takes '1' arguments

Here's the code I'm using:

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			// add a zip archive
			device.FileSystem.AddZipFileArchive("../../media/map-20kdm2.pk3");
                                                // load the level mesh
			IAnimatedMesh q3levelmesh = device.SceneManager.GetMesh("20kdm2.bsp");
			ISceneNode q3node = device.SceneManager.AddOctTreeSceneNode(q3levelmesh.GetMesh(0));

Any suggestions?

[Guest]

use:
ISceneNode node = device.SceneManager.AddOctTreeSceneNode(mesh, null, -1);

always check the function prototypes.

[Guest]

awesome. thanks for the answer.

[Guest]

What is the purpose of the last overload a.k.a the 'sliding' value in the following constructor:

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ISceneNodeAnimator anim = device.SceneManager.CreateCollisionResponseAnimator(
selector, 
camera, 
new Vector3D(30,50,30), 
new Vector3D(0,-3,0), 
new Vector3D(0,50,0), 
0);

If I set it to -1, then the camera drops through the floor and keeps going, however, if I set it to 1 the camera obeys collision detection. Why would you need to set this other than with a positive value?

[Guest]

What is the purpose of the last overload a.k.a the 'sliding' value in the following constructor:

Code: Select all

ISceneNodeAnimator anim = device.SceneManager.CreateCollisionResponseAnimator(
selector, 
camera, 
new Vector3D(30,50,30), 
new Vector3D(0,-3,0), 
new Vector3D(0,50,0), 
0);

If I set it to -1, then the camera drops through the floor and keeps going, however, if I set it to 1 the camera obeys collision detection. Why would you need to set this other than with a positive value?

[Guest]

The .cpp source contains the following:

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		if (smgr->getSceneCollisionManager()->getCollisionPoint(
			line, selector, intersection, tri))
		{
			bill->setPosition(intersection);
				
			driver->setTransform(video::ETS_WORLD, core::matrix4());
			driver->setMaterial(material);
			driver->draw3DTriangle(tri, video::SColor(0,255,0,0));
		}

When I convert the matrix4() over to c# I get build errors...here's what I used:

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					if (device.SceneManager.SceneCollisionManager.GetCollisionPoint(line, selector, intersection, tri))
					{
						billboard.Position = intersection;				
						device.VideoDriver.SetTransform(new TransformationState WORLD, new Matrix4 Matrix4());
						device.VideoDriver.SetMaterial(material);
						device.VideoDriver.Draw3DTriangle(tri, new Irrlicht.Video.Color(0,255,0,0));
					}

I've been looking at this too long. The error is in the Matrix4 use...any suggestions?

[Foole]

Try:

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device.VideoDriver.SetTransform(TransformationState.WORLD, new Matrix4());

I can't think why you would put Matrix4 in there twice.

[Guest]

Well Foole, your suggestion was tested and unfortunately i get a different type of build error now.

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A new expression requires () or [] after type
; expected
Invalid expression term ','
; expected
; expected
Invalid expression term ')'

[Foole]

It works here.

I can only guess that you didn't replace the line. ie replace your line (the one with "SetTransform" in it) with my line.

If you still can't get it working, post the whole block of code again.

[Guest]

Hi Foole:: Good one. I'm no longer getting that error for that statement. Thanks for the help.

[Guest]

When creating the line for collision detection, I get the following build error:

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Operator '+' cannot be applied to operands of type 'Irrlicht.Core.Vector3D' and 'Irrlicht.Core.Vector3D'

from the following line:

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Line3D line;
line.start = camera.Position;
line.end = line.start + (camera.Target - line.start).Normalize() * 1000; //produces build error

[Foole]

When creating the line for collision detection, I get the following build error:

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Operator '+' cannot be applied to operands of type 'Irrlicht.Core.Vector3D' and 'Irrlicht.Core.Vector3D'

Yup that's a bug in the bindings. I wrote a post about it a while ago but I didn't get a response.

Your options are:

• - Fix the bindings.
  - Write your own vector addition function in C#
  - Use Vector3D.op_Addition(o1, o2) instead (Not sure if this works)