Help with particle/beam

[empirepro]

I am trying to make a star ship thats able to shoot a laser beam. I have tried the beam scene node but it doesn't show up when I activate it. here is the code:

laser.h

Code: Select all

#include <irrlicht.h>
#include <iostream>
#include <ITexture.h>
#include <SMaterial.h>

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

// Just a simple wrapper :D
struct IrrQuad {
   video::S3DVertex verts[4];
};

class CBeamNode : public scene::ISceneNode {
   private:
      // The beam material.
      video::SMaterial material;

      // Start/End Points
      core::vector3df vStart;
      core::vector3df vEnd;

      // Bounding Box
      core::aabbox3d<f32> Box;

      // Size of the beam
      float flScale;

      // Beam color
      video::SColor beamColor;

      void DrawQuad( IrrQuad& quad ) {
         u16 indices[] = { 0,2,3, 2,1,3, 1,0,3, 2,0,1 };
         video::IVideoDriver* driver = SceneManager->getVideoDriver();
         driver->setMaterial(material);
         driver->drawIndexedTriangleList( &quad.verts[0], 4, &indices[0], 4 );
      }

      // Thanks to whoever wrote this little function :)
      core::vector3df getTargetAngle( core::vector3df v, core::vector3df r) {
         //v -current node position
         //r -target node position

         core::vector3df angle;
         float x,y,z;
         x = r.X - v.X;
         y = r.Y - v.Y;
         z = r.Z - v.Z;

         //angle in X-Z plane
         angle.Y = atan2 (x, z);
         angle.Y *= (180 / 3.14); //converting from rad to degrees

         //just making sure angle is somewhere between 0-360 degrees
         if(angle.Y < 0) angle.Y += 360;
         if(angle.Y >= 360) angle.Y -= 360;

         //angle in Y-Z plane while Z and X axes are already rotated around Y
         float z1 = sqrt(x*x + z*z);

         angle.X = atan2 (z1, y);
         angle.X *= (180 / 3.14); //converting from rad to degrees
         angle.X -= 90;

         //just making sure angle is somewhere between 0-360 degrees
         if(angle.X < 0) angle.X += 360;
         if(angle.X >= 360) angle.X -= 360;

         return angle;
      }

   public:

      CBeamNode( scene::ISceneNode* parent, scene::ISceneManager *mgr, s32 id, char* szBeam ) : scene::ISceneNode( parent, mgr, id ) {
         // Setup the beam material
         material.Wireframe = false;
         material.Lighting = false;
         material.MaterialType = video::EMT_TRANSPARENT_ADD_COLOR;
		 video::ITexture* texture = mgr->getVideoDriver( )->getTexture( szBeam );
         material.setTexture(0, texture);
		 

         // Default to 32 units for the scale
         flScale = 32.0;

         // Default to white
         beamColor.set( 255, 255, 255, 255 );
      }

      virtual void OnPreRender( ) {
         if( IsVisible ) {
            SceneManager->registerNodeForRendering( this );
         }
      }

      virtual void render( ) {
        SceneManager->getVideoDriver()->setTransform(irr::video::ETS_WORLD, AbsoluteTransformation);

         // Figure out quads based on start/end points.
         core::matrix4 m;
         m.setRotationDegrees( getTargetAngle( vStart, vEnd ) );
         core::vector3df vUp( 0, 1, 0 );
         core::vector3df vRight( -1, 0, 0 );
         m.transformVect( vRight );
         m.transformVect( vUp );

         // Draw the first cross
         IrrQuad beam;
         beam.verts[0] = video::S3DVertex( vStart + vUp * flScale, core::vector3df( 1, 1, 0 ), beamColor, core::vector2df( 0, 1 ) );
         beam.verts[1] = video::S3DVertex( vStart + vUp * -flScale, core::vector3df( 1, 0, 0 ), beamColor, core::vector2df( 1, 1 ) );
         beam.verts[2] = video::S3DVertex( vEnd + vUp * -flScale, core::vector3df( 0, 1, 1 ), beamColor, core::vector2df( 1, 0 ) );
         beam.verts[3] = video::S3DVertex( vEnd + vUp * flScale, core::vector3df( 0, 0, 1 ), beamColor, core::vector2df( 0, 0 ) );
         DrawQuad( beam );

         // Draw the second cross.
         beam.verts[0] = video::S3DVertex( vStart + vRight * flScale, core::vector3df( 1, 1, 0 ), beamColor, core::vector2df( 0, 1 ) );
         beam.verts[1] = video::S3DVertex( vStart + vRight * -flScale, core::vector3df( 1, 0, 0 ), beamColor, core::vector2df( 1, 1 ) );
         beam.verts[2] = video::S3DVertex( vEnd + vRight * -flScale, core::vector3df( 0, 1, 1 ), beamColor, core::vector2df( 1, 0 ) );
         beam.verts[3] = video::S3DVertex( vEnd + vRight * flScale, core::vector3df( 0, 0, 1 ), beamColor, core::vector2df( 0, 0 ) );
         DrawQuad( beam );
      }

      virtual const core::aabbox3d<f32>& getBoundingBox() const {
         return Box;
      }

      virtual s32 getMaterialCount() {
         return 1;
      }

      virtual video::SMaterial& getMaterial(s32 i) {
         return material;
      }

      void SetStartPoint( core::vector3df pos ) {
         vStart = pos;
      }

      void SetEndPoint( core::vector3df pos ) {
         vEnd = pos;
      }

      void SetBeamScale( float size ) {
         flScale = size;
      }

      void SetBeamColor( video::SColor color ) {
         beamColor = color;
      }
};

main.cpp

Code: Select all

/*
This Tutorial shows how to move and animate SceneNodes. The
basic concept of SceneNodeAnimators is shown as well as manual
movement of nodes using the keyboard.

As always, I include the header files, use the irr namespace,
and tell the linker to link with the .lib file.
*/
#include <irrlicht.h>
[b]#include "laser.h"[/b]
#include "flightfunctions.h"
#include "shipcontrols.h"
#include <iostream>

using namespace irr;

double playerspeed = 0.0;

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




int main()
{
	// let user select driver type

	video::E_DRIVER_TYPE driverType = video::EDT_DIRECT3D9;

	printf("Please select the driver you want for this example:\n"\
		" (a) Direct3D 9.0c\n (b) Direct3D 8.1\n (c) OpenGL 1.5\n"\
		" (d) Software Renderer\n (e) Burning's Software Renderer\n"\
		" (f) NullDevice\n (otherKey) exit\n\n");

	char i;
	std::cin >> i;

	switch(i)
	{
		case 'a': driverType = video::EDT_DIRECT3D9;break;
		case 'b': driverType = video::EDT_DIRECT3D8;break;
		case 'c': driverType = video::EDT_OPENGL;   break;
		case 'd': driverType = video::EDT_SOFTWARE; break;
		case 'e': driverType = video::EDT_BURNINGSVIDEO;break;
		case 'f': driverType = video::EDT_NULL;     break;
		default: return 0;
	}	

	// create device
	MyEventReceiver receiver;

	IrrlichtDevice* device = createDevice( driverType, core::dimension2d<s32>(1000, 800),
		16, false, false, false, &receiver);

	if (device == 0)
		return 1; // could not create selected driver.


	video::IVideoDriver* driver = device->getVideoDriver();
	scene::ISceneManager* smgr = device->getSceneManager();
    smgr->addSkyDomeSceneNode(driver->getTexture("media/Textures/sky.bmp"),32,32,1.0f,2.0f);
    smgr->loadScene("Media/Levels/space.irr");
	scene::ISceneNode* node1 = smgr->addSphereSceneNode(); //replace with what ever you want
	if (node1)
	{
		node1->setMaterialFlag(EMF_LIGHTING, false);
		node1->setMaterialTexture( 0, driver->getTexture("media/Textures/borg.psd") );
		node1->setPosition(core::vector3df(-550,0,0));
	}
  
	scene::ISceneNode* node2 = smgr->addCubeSceneNode(); //just for reference
   if (node2)
      node2->setMaterialFlag(video::EMF_LIGHTING, false);
   node2->setPosition(core::vector3df(500,0,100));

   scene::ICameraSceneNode *camera = device->getSceneManager()->addCameraSceneNode();
   [b]CBeamNode* beam = new CBeamNode( smgr->getRootSceneNode( ), smgr, 200, "laserbeam.bmp" );[/b]

   int lastFPS = -1;

   while(device->run())
   { 
	   
	   driver->beginScene(true, true, SColor(255,100,101,140));
        smgr->drawAll();
       
        // direction control
        if(keys[irr::KEY_LEFT])
        {
            turn(node1, 0.5);
        }
        if(keys[irr::KEY_RIGHT])
        {
            turn(node1, -0.5);
        }
        if(keys[irr::KEY_UP])
        {
            pitch(node1, 0.5);
        }
        if(keys[irr::KEY_DOWN])
        {
            pitch(node1, -0.5);
        }
        if(keys[irr::KEY_COMMA])
        {
            roll(node1, 0.01);
        }
        if(keys[irr::KEY_PERIOD])
        {
            roll(node1, -0.01);
        }
       
        // movement control
        if(keys[irr::KEY_KEY_W])
        {
             playerspeed = playerspeed + 0.5;
        }
        if(keys[irr::KEY_KEY_S])
        {
             playerspeed = playerspeed - 0.0001;
             if (playerspeed = -0.01)
                    playerspeed = -.009;               
            move(node1, core::vector3df(0,0,playerspeed));
        }
        if(keys[irr::KEY_KEY_Q])
        {
             playerspeed = 0;
        }
		[b]if(keys[irr::KEY_KEY_F])
        {
			
beam->SetStartPoint( core::vector3df( -500, 0, 0 ) );
beam->SetEndPoint( core::vector3df( 500, 0, 0 ) );
beam->SetBeamColor( video::SColor( 200, 0, 255, 0 ) );
beam->SetBeamScale(1.5);
		}[/b]
		
       
        move(node1, core::vector3df(0,0,playerspeed));
       
        makeCockpit(camera, node1, core::vector3df(0,7,-30));
       
        driver->endScene();
		int fps = driver->getFPS();

		if (lastFPS != fps)
		{
			core::stringw tmp(L"Movement Example - Irrlicht Engine [");
			tmp += driver->getName();
			tmp += L"] fps: "; 
			tmp += fps;

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

   return 1;
} 

The code compiles just fine but when I press the F button I am not able to see anything.

[rogerborg]

Presumably you want to pass the result of node1->getAbsolutePosition() to SetStartPoint().

Is your "laserbeam.bmp" texture in your working directory rather than your "media/Textures" directory? I notice that you haven't qualified the path, and that CBeamNode doesn't validate the texture.

[cdrwolfe]

I use a similar one though it is in C# i'am afraid, what exactly are you trying to create with regards to ship firing?

Regards Wolfe

[empirepro]

Presumably you want to pass the result of node1->getAbsolutePosition() to SetStartPoint().

Is your "laserbeam.bmp" texture in your working directory rather than your "media/Textures" directory? I notice that you haven't qualified the path, and that CBeamNode doesn't validate the texture.

The texture is in the top directory. When I start it up it loads the texture just fine. It just doesn't show anything when I press the button to fire it. right now the only thing I am worried about is getting it to show up on the screen once it shows up then I will worry about trying to get it aligned to the ship and everything.

[rogerborg]

Oh, got it.

OnPreRender() should be OnRegisterSceneNode(). That's changed since Irrlicht 1.3.

[empirepro]

I changed that and its still not showing up

[rogerborg]

Presumably you've got some other code that actually moves the camera to a position where it could see the beam node? I moved it to (0, 0, -50) in order to see the node.

It occurs to me that the node isn't setting up its bounding box, but that's not causing a problem on my local version.

Other than that, all that I can suggest is that you break out your debugger and check that the node is actually registering itself for rendering, and being rendered.

[empirepro]

I am now using a different tactic for lasers that is now working. Now all that I need to figure out is collision detection and particle system for explosions.

[rogerborg]

On a Satisfaction Scale of Kathy Bates to Alyson Hannigan, I rate this thread a Tony Collette: Borderline Self Recriminations, Would Not Do Again.

[cdrwolfe]

LOL,

On a side note, what type of collision detection you looking to implement.

Regards Wolfe