Motion problem

[MG]

I made program which opens .3ds file (circle) and display it. Keys W and S are for object rotation.
But motion isn't fluent. So i want soft motion of that object just like with
createFlyCircleAnimator function. How to do that?

Thanks a lot

Code: Select all

#include <irrlicht.h>

using namespace irr;
using namespace core;
using namespace scene;
using namespace video;
using namespace io;
using namespace gui; 

#pragma comment(lib, "Irrlicht.lib")

ICameraSceneNode* camera = 0;
IrrlichtDevice *device;
ISceneNode* node = 0;
ISceneNode* node_light = 0;
IVideoDriver* driver;
ISceneManager* smgr;
ISceneNodeAnimator* anim = 0; 

core::vector3df v;
core::vector3df r;

class MyEventReceiver : public IEventReceiver
{
public:
	virtual bool OnEvent(SEvent event)
	{
		switch(event.KeyInput.Key)
			{
			case KEY_KEY_W:
			case KEY_KEY_S:
				{
					v = node->getRotation();
					v.Z += event.KeyInput.Key == KEY_KEY_W ? 2.0f : -2.0f;
					node->setRotation(v);
				} return true;

			case KEY_ESCAPE:
				if (event.KeyInput.PressedDown) {
					device->closeDevice();
					return true;
				} return true;
			} 
		return true;
	}
};


int main()
{
	MyEventReceiver receiver;

	device = createDevice(video::DT_DIRECTX8,
		core::dimension2d<s32>(800, 600),16, false, true, &receiver);

	driver = device->getVideoDriver();
	smgr = device->getSceneManager();
	
	IAnimatedMesh* mesh = smgr->getMesh("scenes/brana.3ds");
	//node = smgr->addAnimatedMeshSceneNode(mesh);
	//anim = smgr->createFlyCircleAnimator (core::vector3df(0,0,0),-20.0f);
	//node->addAnimator(anim);
	//anim->drop(); 

	v = node->getPosition();
	r = node->getRotation();

	v.Z=1;
	v.Y=0;
	v.X=0;

	r.X=90;

	node->setRotation(r);
	node->setPosition(v);

	node_light = smgr->addLightSceneNode(0, core::vector3df(0,0,0), 
		video::SColorf(1.0f, 1.0f, 1.0f, 1.0f), 600.0f);

	node_light = smgr->addLightSceneNode(0, core::vector3df(0,100,-100), 
		video::SColorf(1.0f, 1.0f, 1.0f, 1.0f), 600.0f);

	smgr->addCameraSceneNode(0, vector3df(0,0,-60), vector3df(0,0,0));

	int lastFPS = -1;

	while(device->run())
	{
		driver->beginScene(true, true, 0);

		smgr->drawAll();

		driver->endScene();

		int fps = driver->getFPS();

		if (lastFPS != fps)
		{
			wchar_t tmp[1024];
			swprintf(tmp, 1024, L"SpecialFX example - Irrlicht Engine"\
				L"(fps:%d) Triangles:%d", fps,
				driver->getPrimitiveCountDrawn());

			device->setWindowCaption(tmp);
			lastFPS = fps;
		}
	}

	device->drop();
	return 0;
}

[MG]

Realy anybody dont know, how to make smooth rotate and move objekt??? When i inc and dec. v.Z object moving object isn't smooth. I need result as is in 'prueba2_irr'. Its possible make this with matrix transformation or how to do that?

Thanks a help

[DarkWhoppy]

I'm tryin got figure this one out myself... I tried using "while(something >= something_else) " but i'm still trying another way right 'now'.

[t]

Store a rotation velocity and update the rotation of the object in the main loop, not in the keypress event.

[Gonosz]

... and you should get the elapsed time since the last frame and multiply the velocity with it, and then add it to the position or whatever you're changing. This way your object won't move faster on better machines.

[MG]

Already am it solved. In OnEvent is only
if(event.KeyInput.Key == KEY_KEY_W) rot_left=true;

and in mail loop is procedure updatescene(), in which is getRotation();

Thanks