move forwards with FPS cam

wEEp · Post by **wEEp** » Wed Mar 18, 2009 11:35 am

Hey folks,

I want to programm a FPS camera which u can move around. I got this src from the tut:


//NODE = the cameranode (scenecamera....)
 const f32 MOVEMENT_SPEED = 5.f;

        while(device->run())
        {
                // Work out a frame delta time.
                const u32 now = device->getTimer()->getTime();
                const f32 frameDeltaTime = (f32)(now - then) / 1000.f; // Time in seconds
                then = now;

                core::vector3df nodePosition = node->getPosition();

                if(receiver.IsKeyDown(irr::KEY_KEY_W))
                        nodePosition.Y += MOVEMENT_SPEED * frameDeltaTime;
                else if(receiver.IsKeyDown(irr::KEY_KEY_S))
                        nodePosition.Y -= MOVEMENT_SPEED * frameDeltaTime;

                if(receiver.IsKeyDown(irr::KEY_KEY_A))
                        nodePosition.X -= MOVEMENT_SPEED * frameDeltaTime;
                else if(receiver.IsKeyDown(irr::KEY_KEY_D))
                        nodePosition.X += MOVEMENT_SPEED * frameDeltaTime;

                node->setPosition(nodePosition); 

                driver->beginScene(true, true, video::SColor(255,113,113,133));

....

I declared then a node as camera node. When i now press "W" the camare moves to the top and not straight forward. Do u have an idea how to make it that the camera moves forward? I tested alot etc. but i dont get the solution.

THANKS

Sylence · Post by **Sylence** » Wed Mar 18, 2009 11:40 am

It moves upwards because the Y axis is for up and down.

You have to change the X axis.

Then if you have a node that is somehow rotated you have to rotate the movement according to the nodes rotation. I bet there are snippets for this somewhere in the forums.

wEEp · Post by **wEEp** » Wed Mar 18, 2009 11:48 am

ye why it moves to the top is clear but i dont have an idea how to change it...im playing abit around

THanks for ur help!

edit:// Im such an idiot...-.-

nodePosition.Z += MOVEMENT_SPEED * frameDeltaTime;

Sorry...i just had 3hrs of sleep the last 2 days ^_^

wEEp · Post by **wEEp** » Wed Mar 18, 2009 1:31 pm

Sorry...i've got aother problem

Code: Select all

const f32 MOVEMENT_SPEED = 500.f;

	while(device->run())
	if (device->isWindowActive())
	{
		const u32 now = device->getTimer()->getTime();
		const f32 frameDeltaTime = (f32)(now - then) / 1000.f; // Time in seconds
		then = now;

		/* Check if keys W, S, A or D are being held down, and move the
		sphere node around respectively. */
		core::vector3df nodePosition = camera->getPosition();

		if(receiver.IsKeyDown(irr::KEY_KEY_W))
			nodePosition.Z += MOVEMENT_SPEED * frameDeltaTime;
		else if(receiver.IsKeyDown(irr::KEY_KEY_S))
			nodePosition.Z -= MOVEMENT_SPEED * frameDeltaTime;

		if(receiver.IsKeyDown(irr::KEY_KEY_A))
			nodePosition.X -= MOVEMENT_SPEED * frameDeltaTime;
		else if(receiver.IsKeyDown(irr::KEY_KEY_D))
			nodePosition.X += MOVEMENT_SPEED * frameDeltaTime;

		camera->setPosition(nodePosition);

How can i make that he goes there where my camera looks at not just the Z axis.

When i press W the camera just goes to one side but i want that the camera goes there where i look at.

JP · Post by JP » Wed Mar 18, 2009 4:38 pm

Why are you not just using the built in FPS camera?

If you're hell bent on making your own just look at the FPS camera source to get the idea of how to do it.

wEEp · Post by **wEEp** » Wed Mar 18, 2009 8:51 pm

how can i do it with ur solution? Can u give me some examples?

vitek · Post by **vitek** » Wed Mar 18, 2009 10:49 pm

Go back and look at the source code for the tutorials. Nearly every one of them uses the FPS camera. The demo shows how to use a keyboard map if you want to assign different keys to the camera movement actions.

Travis

wEEp · Post by **wEEp** » Thu Mar 19, 2009 7:16 am

Yes, but i want to move the camera arond the map.

I looked alrdy in the demo but i couldn't find how it moves the camera around.

JP · Post by JP » Thu Mar 19, 2009 8:35 am

It's just all setup for you... You create an FPS camera with the scenemanager (smgr->addCameraSceneNodeFPS()) and then when you press the arrow keys it moves the camera, when you move the mouse it rotates the camera... simple as that, it's all handled within Irrlicht.

As vitek says the Demo example shows you how you can assign different keys to the movement of the FPS camera, search the example for SKeyMap and it should be clear.

wEEp · Post by **wEEp** » Thu Mar 19, 2009 8:46 am

JP wrote:It's just all setup for you... You create an FPS camera with the scenemanager (smgr->addCameraSceneNodeFPS()) and then when you press the arrow keys it moves the camera, when you move the mouse it rotates the camera... simple as that, it's all handled within Irrlicht.

OMG i didn't know that..im so sorry

and i looked in the demo and i searched for "KEY_KEY_W" this is why i couldn't find it.
edit://

I got it now...thanks for all ur help!!!