assigning a plane

bitplane · Post by **bitplane** » Wed Jul 13, 2005 6:41 am

i want to set a plane3d equal to an edge of a bounding box, but planes only have a position and a normal.
are they infinite length or am I missing something?

VeneX · Post by **VeneX** » Thu Sep 08, 2005 1:14 pm

yeah what exactly is a plane3d, I thougth it could be used for the rotation of an triangle: core::plane3d<f32> rotation = triangle.getPlane();
If I am right I might have done good by tying: bullethole->setRotation(rotation); to set the flat model on the triangle with the same rotation, but now I have an error: cant convert from plane3d to vector3df.

If I use the right function: how to solve this convertion,
and if I don't: what function should I use than?

bitplane · Post by **bitplane** » Thu Sep 08, 2005 3:25 pm

apparently planes are mathematical planes, they have no length/width, just position vector and a normal.
I'd guess you go like setRotation( rotation.Normal );

VeneX · Post by **VeneX** » Thu Sep 08, 2005 4:53 pm

strangely all the models get set to one same direction, unless the triangle faces point into another direction

Code: Select all

if (sm->getSceneCollisionManager()->getCollisionPoint(
		line, metaSelector, end, triangle))
     core::plane3d<f32> rotation = triangle.getPlane();


selectedSceneNode = sm->getSceneCollisionManager()->
	          getSceneNodeFromCameraBB(sm->getActiveCamera());

if (selectedSceneNode == doos)
{
mesh = sm->getMesh("hole.ms3d");
				bullethole = sm->addAnimatedMeshSceneNode(mesh);
				bullethole->setMaterialTexture(0, device->getVideoDriver()->getTexture("hole.jpg"));
				bullethole->setMaterialFlag(video::EMF_LIGHTING, false);
				bullethole->setMaterialType(video::EMT_TRANSPARENT_ADD_COLOR);
				bullethole->setPosition(Impacts[i].pos);
				//bullethole->setRotation(sm->getActiveCamera()->getRotation());
				bullethole->setRotation(rotation.Normal);}

The function to make only the 'bullethole' on the node 'doos' doesn't work that great either

VeneX · Post by **VeneX** » Mon Sep 12, 2005 10:23 am

can't figure out

but the selectednode for 'doos' doesn't work because he checks the camera when the 'bullet' hits the wall

VeneX · Post by **VeneX** » Mon Sep 12, 2005 5:45 pm

I made it a:

Code: Select all

core::vector3df rotation;
core::vector3df out = triangle.getNormal();
		imp.rotation = out;
		out.setLength(0.03f);

		imp.when = 1;
		imp.outVector = out;
		imp.pos = end;
Impacts.push_back(imp);


//and all for the mesh, I only changed:
bullethole->setRotation(Impacts[i].rotation);

The source is like the techdemo.
The bulletholes are not anymore set the same direction, but it nearly seems to be random, I have no idea what's wrong.

Dances · Post by **Dances** » Mon Sep 12, 2005 5:50 pm

Its not random, its facing almost a complete 90 degrees from whatever face its in, try setting a rotation of 90 or so after getting the normal.

VeneX · Post by **VeneX** » Mon Sep 12, 2005 6:11 pm

Dances wrote:Its not random, its facing almost a complete 90 degrees from whatever face its in, try setting a rotation of 90 or so after getting the normal.

I tried to edit the model some times, on one side of the cube (a.k.a. doos) the holes are facing in the right way, while the holes on the other side will point a whole other direction

this are 3 sides of the cube, Try for yourself, the demo is uploaded on my website http://members.lycos.nl/phpgenerals/plethora

bitplane · Post by **bitplane** » Mon Sep 12, 2005 8:04 pm

okay this is just a guess, but the normal might be a position rather than a rotation. use getTargetAngle function from the AI class to convert to a rotation

VeneX · Post by **VeneX** » Mon Sep 12, 2005 8:22 pm

getTargetAngle from the AI class?
I can only find getTarget

Code: Select all

pas = sm->addParticleSystemSceneNode(false, 0, -1, Impacts[i].pos);

			pas->setParticleSize(core::dimension2d<f32>(10.0f, 10.0f));

			scene::IParticleEmitter* em = pas->createBoxEmitter(
				core::aabbox3d<f32>(-5,-5,-5,5,5,5),
				Impacts[i].outVector, 20,40, video::SColor(0,255,255,255),video::SColor(0,255,255,255),
				1200,1600, 20);

This is the code from the techdemo and the particle smoke which is created is in the same angle as the face it's created on

only hard to figure out what it should be

Dances · Post by **Dances** » Tue Sep 13, 2005 2:06 am

getTarget DOES return an angle, perhaps that is what he meant.

VeneX · Post by **VeneX** » Tue Sep 13, 2005 8:29 am

If I do rotation = camera->getTarget(); it have nearly the same 'random' rotation

bitplane · Post by **bitplane** » Tue Sep 13, 2005 9:45 am

try control+scrollwheel, it zooms in on text on a web page you know

http://irrforge.org/index.php/AI_Class_For_Irrlicht

now use the code from getTargetAngle to find the angle between the plane's position and its normal.

VeneX · Post by **VeneX** » Tue Sep 13, 2005 11:17 am

I know for sure that AI class function is different than I ment. This getTargetAngle does calculates the angle between the node and the target, but I guess it only calculates from a boundingbox, I have to know how to get the rotation of a single triangle.

bitplane · Post by **bitplane** » Tue Sep 13, 2005 12:11 pm

it calculates angles, thats all you need.
edit:
to completely spell it out for you, change the first 2 lines to
v = vector3df(0,0,0)
r = plane.Normal;