Here's the low-down:
Let's say you want to load a Skinned Animated character into Irrlicht.
> You want to animate it using the standard keyframe data from the file (ie, Irrlicht does all the dirty-work as it's supposed to).
> But you also want to be able to move certain Joints around, make them look at something or position them to a particular place, or for ragdolling, etc, etc.
How to do it?
Simply transform the Joint's desired position and rotation values by its Parent's INVERSE Absolute Transformation!
A demonstration:
Code: Select all
// Irrlicht
#include <irrlicht.h>
using namespace irr;
using namespace core;
using namespace scene;
using namespace video;
using namespace io;
using namespace gui;
#ifdef _IRR_WINDOWS_
#pragma comment(lib, "Irrlicht.lib")
#pragma comment(linker, "/subsystem:windows /ENTRY:mainCRTStartup")
#endif
// MAIN
int main()
{
// create Irrlicht device
IrrlichtDevice* device = createDevice( video::EDT_OPENGL, dimension2d<s32>(800, 600), 32,
false, false);
if (device == 0)
return 1; // could not create selected driver.
video::IVideoDriver* driver = device->getVideoDriver();
scene::ISceneManager* smgr = device->getSceneManager();
// create camera
smgr->addCameraSceneNodeFPS(0, 100.0f, .1f);
// Load Char
IAnimatedMesh* CharMesh = smgr->getMesh("../../media/dwarf.X");
if (!CharMesh) return 1;
IAnimatedMeshSceneNode* CharNode = smgr->addAnimatedMeshSceneNode( CharMesh );
if (!CharNode) return 1;
// Initilise
CharNode->setMaterialFlag(EMF_LIGHTING, false);
CharNode->setAnimationSpeed(10);
// Prepare for Joint Control
CharNode->setJointMode(EJUOR_CONTROL); //To write positions to the mesh on render
int lastFPS = -1;
f32 headRotation = 0;
f32 headPosition = 0;
while(device->run())
{
// Animate character manually
CharNode->animateJoints();
// Get the Joint you want to MANIPULATE, and its Parent
IBoneSceneNode* thisJoint = CharNode->getJointNode("head");
if( thisJoint )
{
ISceneNode* parentJoint = thisJoint->getParent();
if( parentJoint )
{
// Get the default (animated) Joint's position and rotation
vector3df jointPos = thisJoint->getAbsolutePosition();
vector3df jointRot = thisJoint->getAbsoluteTransformation().getRotationDegrees();
// Get the absolute INVERSE Transformation matrix of the parent
matrix4 iparentTransform = parentJoint->getAbsoluteTransformation();
iparentTransform.makeInverse();
// Set the Absolute Position or Rotation of the Joint without fear!
vector3df newJointPos = jointPos + vector3df( 0, 1+(sin(headPosition)*2), 0 );
vector3df newJointRot = vector3df( 0, headRotation, 0 );
// Transform the Position by the Parent's Inverse matrix before applying it
iparentTransform.transformVect( newJointPos );
// APPLY
thisJoint->setPosition( newJointPos );
thisJoint->setRotation( newJointRot );
}
}
// funny
headPosition += 0.01f;
if( headPosition > 2*PI ){ headPosition -= 0; }
headRotation += 0.5f;
if( headRotation > 360 ){ headRotation -= 360; }
// do Irrlicht stuff
driver->beginScene(true, true, video::SColor(255,113,113,133));
smgr->drawAll(); // draw the 3d scene
device->getGUIEnvironment()->drawAll(); // draw the gui environment (the logo)
driver->endScene();
int fps = driver->getFPS();
if (lastFPS != fps)
{
core::stringw tmp(L"fmx's funny dwarf head joint manipulation demo! [");
tmp += driver->getName();
tmp += L"] fps: ";
tmp += fps;
device->setWindowCaption(tmp.c_str());
lastFPS = fps;
}
}
// show cursor
// device->getCursorControl()->setVisible(true);
device->drop();
return 0;
}
Just copy and paste this into the HelloWorld example or something.
Binary and source to quickly see what it does:
http://www.mediafire.com/?lmazmtzzzur
I assure you that you wont be dissapointed.
