/** \brief Perform the basic scenegraph initialization
*
* Initializes the PLIB SSG library, creates the scenegraph
* root, a rendering context and the sun.
*/
void initialize_scenegraph()
{
// Initialize SSG
ssgInit();
// add to SSG function for read JPEG Textures
::ssgAddTextureFormat ( ".jpg", ssgLoadJPG);
// font
puSetDefaultFonts ( FONT_HELVETICA_14, FONT_HELVETICA_14 );
// Some basic OpenGL setup
sgVec4 skycol;
sgSetVec4 ( skycol, 0.0f, 0.0f, 0.0f, 1.0f ) ;
glClearColor ( skycol[0], skycol[1], skycol[2], skycol[3] ) ;
glEnable ( GL_DEPTH_TEST ) ;
// Set up the viewing parameters
context = new ssgContext();
context->setFOV ( 35.0f, 0 ) ;
context->setNearFar ( 1.0f, 10000.0f ) ;
context->makeCurrent();
ssgModelPath("");
ssgTexturePath("textures");
// Create a root node
scene = new ssgRoot();
// Set up a light source
sgVec4 lightamb;
sgSetVec4(lightamb , 0.2f, 0.2f, 0.2f, 1.0f);
ssgGetLight(0)->setPosition(lightposn);
ssgGetLight(0)->setColour(GL_AMBIENT, lightamb);
ssgGetLight(0)->setPosition(lightposn);
}
static ssgTransform *initWheel(tCarElt *car, int wheel_index)
{
int i, j, k;
float alpha;
sgVec3 vtx;
sgVec4 clr;
sgVec3 nrm;
sgVec2 tex;
tdble b_offset = 0.0f;
tdble curAngle = 0.0f;
#define BRK_BRANCH 16
#define BRK_ANGLE (2.0 * M_PI / (tdble)BRK_BRANCH)
#define BRK_OFFSET 0.2
switch(wheel_index) {
case FRNT_RGT:
curAngle = -(M_PI / 2.0 + BRK_ANGLE);
b_offset = BRK_OFFSET - car->_tireWidth(wheel_index) / 2.0;
break;
case FRNT_LFT:
curAngle = -(M_PI / 2.0 + BRK_ANGLE);
b_offset = car->_tireWidth(wheel_index) / 2.0 - BRK_OFFSET;
break;
case REAR_RGT:
curAngle = (M_PI / 2.0 - BRK_ANGLE);
b_offset = BRK_OFFSET - car->_tireWidth(wheel_index) / 2.0;
break;
case REAR_LFT:
curAngle = (M_PI / 2.0 - BRK_ANGLE);
b_offset = car->_tireWidth(wheel_index) / 2.0 - BRK_OFFSET;
break;
}
/* hub */
ssgVertexArray *brk_vtx = new ssgVertexArray(BRK_BRANCH + 1);
ssgColourArray *brk_clr = new ssgColourArray(1);
ssgNormalArray *brk_nrm = new ssgNormalArray(1);
tdble hubRadius;
/* center */
vtx[0] = vtx[2] = 0.0;
vtx[1] = b_offset;
brk_vtx->add(vtx);
hubRadius = car->_brakeDiskRadius(wheel_index) * 0.6;
for (i = 0; i < BRK_BRANCH; i++) {
alpha = (float)i * 2.0 * M_PI / (float)(BRK_BRANCH - 1);
vtx[0] = hubRadius * cos(alpha);
vtx[1] = b_offset;
vtx[2] = hubRadius * sin(alpha);
brk_vtx->add(vtx);
}
clr[0] = clr[1] = clr[2] = 0.0;
clr[3] = 1.0;
brk_clr->add(clr);
nrm[0] = nrm[2] = 0.0;
// Make normal point outside to have proper lighting.
switch(wheel_index) {
case FRNT_RGT:
case REAR_RGT:
nrm[1] = -1.0;
break;
case FRNT_LFT:
case REAR_LFT:
nrm[1] = 1.0;
break;
}
brk_nrm->add(nrm);
ssgVtxTable *brk = new ssgVtxTable(GL_TRIANGLE_FAN, brk_vtx, brk_nrm, NULL, brk_clr);
brk->setCullFace(0);
brk->setState(commonState);
ssgTransform *wheel = new ssgTransform;
wheel->addKid(brk);
/* Brake disk */
brk_vtx = new ssgVertexArray(BRK_BRANCH + 4);
brk_clr = new ssgColourArray(1);
brk_nrm = new ssgNormalArray(1);
for (i = 0; i < (BRK_BRANCH / 2 + 2); i++) {
alpha = curAngle + (float)i * 2.0 * M_PI / (float)(BRK_BRANCH - 1);
vtx[0] = car->_brakeDiskRadius(wheel_index) * cos(alpha);
vtx[1] = b_offset;
vtx[2] = car->_brakeDiskRadius(wheel_index) * sin(alpha);
brk_vtx->add(vtx);
vtx[0] = car->_brakeDiskRadius(wheel_index) * cos(alpha) * 0.6;
vtx[1] = b_offset;
vtx[2] = car->_brakeDiskRadius(wheel_index) * sin(alpha) * 0.6;
brk_vtx->add(vtx);
}
clr[0] = clr[1] = clr[2] = 0.1;
clr[3] = 1.0;
brk_clr->add(clr);
//nrm[0] = nrm[2] = 0.0;
//nrm[1] = 1.0;
brk_nrm->add(nrm);
brk = new ssgVtxTable(GL_TRIANGLE_STRIP, brk_vtx, brk_nrm, NULL, brk_clr);
brk->setCullFace(0);
brk->setState(brakeState);
grCarInfo[grCarIndex].brkColor[wheel_index] = brk_clr;
wheel->addKid(brk);
/* Brake caliper */
brk_vtx = new ssgVertexArray(BRK_BRANCH - 4);
brk_clr = new ssgColourArray(1);
brk_nrm = new ssgNormalArray(1);
for (i = 0; i < (BRK_BRANCH / 2 - 2); i++) {
alpha = - curAngle + (float)i * 2.0 * M_PI / (float)(BRK_BRANCH - 1);
vtx[0] = (car->_brakeDiskRadius(wheel_index) + 0.02) * cos(alpha);
vtx[1] = b_offset;
vtx[2] = (car->_brakeDiskRadius(wheel_index) + 0.02) * sin(alpha);
brk_vtx->add(vtx);
vtx[0] = car->_brakeDiskRadius(wheel_index) * cos(alpha) * 0.6;
vtx[1] = b_offset;
vtx[2] = car->_brakeDiskRadius(wheel_index) * sin(alpha) * 0.6;
brk_vtx->add(vtx);
}
clr[0] = 0.2;
clr[1] = 0.2;
clr[2] = 0.2;
clr[3] = 1.0;
brk_clr->add(clr);
//nrm[0] = nrm[2] = 0.0;
//nrm[1] = 1.0;
brk_nrm->add(nrm);
brk = new ssgVtxTable(GL_TRIANGLE_STRIP, brk_vtx, brk_nrm, NULL, brk_clr);
brk->setCullFace(0);
brk->setState(commonState);
wheel->addKid(brk);
DBG_SET_NAME(wheel, "Wheel", grCarIndex, wheel_index);
grCarInfo[grCarIndex].wheelPos[wheel_index] = wheel;
/* wheels */
ssgTransform *whrotation = new ssgTransform;
grCarInfo[grCarIndex].wheelRot[wheel_index] = whrotation;
wheel->addKid(whrotation);
ssgSelector *whselector = new ssgSelector;
whrotation->addKid(whselector);
grCarInfo[grCarIndex].wheelselector[wheel_index] = whselector;
float wheelRadius = car->_rimRadius(wheel_index) + car->_tireHeight(wheel_index);
// Create wheels for 4 speeds (stillstanding - fast --> motion blur, look at the texture).
for (j = 0; j < 4; j++) {
ssgBranch *whl_branch = new ssgBranch;
ssgEntity *whl3d = 0;
// load speed-dependant 3D wheels if available and if detailed wheels are desired.
// wheel data files are located in the wheels directory. first set directory.
if (grUseDetailedWheels == DETAILED) {
const int bufsize = 1024;
char buf[bufsize];
const char* wheel_dir = GfParmGetStr(car->_carHandle, SECT_GROBJECTS, PRM_WHEEL_3D_DIR, 0);
if (wheel_dir != 0) {
snprintf(buf, bufsize, "wheels/%s", wheel_dir);
ssgModelPath(buf);
ssgTexturePath(buf);
}
// set basename for wheel file 0..3 gets appended
const char* wheel_obj = GfParmGetStr(car->_carHandle, SECT_GROBJECTS, PRM_WHEEL_3D, 0);
if (wheel_obj != 0 && wheel_dir != 0) {
snprintf(buf, bufsize, "%s%d.acc", wheel_obj, j);
whl3d = grssgCarLoadAC3D(buf, NULL, car->index);
}
}
// if we have a 3D wheel, use it. otherwise use normal generated wheel...
if (whl3d) {
// Adapt size of the wheel
ssgTransform *whl_size = new ssgTransform;
sgMat4 wheelsz;
sgSetVec4(wheelsz[0], wheelRadius * 2, SG_ZERO, SG_ZERO, SG_ZERO) ;
sgSetVec4(wheelsz[1], SG_ZERO, car->_tireWidth(wheel_index), SG_ZERO, SG_ZERO) ;
sgSetVec4(wheelsz[2], SG_ZERO, SG_ZERO, wheelRadius * 2, SG_ZERO) ;
sgSetVec4(wheelsz[3], SG_ZERO, SG_ZERO, SG_ZERO, SG_ONE) ;
whl_size->setTransform(wheelsz);
whl_size->addKid(whl3d);
whl3d = whl_size;
if (wheel_index == FRNT_RGT || wheel_index == REAR_RGT) {
// flip wheel around so it faces the right way
ssgTransform *whl_mesh_transform = new ssgTransform;
sgCoord wheelpos;
sgSetCoord(&wheelpos, 0, 0, 0, 180, 0, 0);
whl_mesh_transform->setTransform( &wheelpos);
whl_mesh_transform->addKid(whl3d);
whl_branch->addKid(whl_mesh_transform);
} else {
whl_branch->addKid(whl3d);
}
} else {
static sgVec2 toffset[4] = { {0.0, 0.5}, {0.5, 0.5}, {0.0, 0.0}, {0.5, 0.0} };
// TORCS's standard generated wheel
const int WHL_BRANCH = 16;
/* Tread */
{
ssgVertexArray *whl_vtx = new ssgVertexArray(2 * WHL_BRANCH);
ssgColourArray *whl_clr = new ssgColourArray(2 * WHL_BRANCH);
ssgNormalArray *whl_nrm = new ssgNormalArray(1);
whl_nrm->add(nrm);
clr[3] = 1.0;
for (i = 0; i < WHL_BRANCH; i++) {
alpha = (float)i * 2.0 * M_PI / (float)(WHL_BRANCH - 1);
vtx[0] = wheelRadius * cos(alpha);
vtx[2] = wheelRadius * sin(alpha);
vtx[1] = - car->_tireWidth(wheel_index) / 2.0;
whl_vtx->add(vtx);
vtx[1] = car->_tireWidth(wheel_index) / 2.0;
whl_vtx->add(vtx);
if (i % 2) {
clr[0] = clr[1] = clr[2] = 0.15;
} else {
clr[0] = clr[1] = clr[2] = 0.0;
}
whl_clr->add(clr);
whl_clr->add(clr);
}
ssgVtxTable *whl = new ssgVtxTable(GL_TRIANGLE_STRIP, whl_vtx, whl_nrm, NULL, whl_clr);
whl->setState(commonState);
whl->setCullFace(0);
// stripify wheel, should improve performance
ssgStripify(whl);
whl_branch->addKid(whl);
}
/* Rim */
switch(wheel_index) {
case FRNT_RGT:
case REAR_RGT:
b_offset = -0.05;
break;
case FRNT_LFT:
case REAR_LFT:
b_offset = 0.05;
break;
}
// Make inside rim very dark and take care of normals.
float colorfactor[2];
float norm_orig = nrm[1];
if (nrm[1] > 0.0f) {
colorfactor[0] = 0.3f;
colorfactor[1] = 1.0f;
nrm[1] *= -1.0f;
} else {
colorfactor[0] = 1.0f;
colorfactor[1] = 0.3f;
}
for (k = 0; k < 2; k++) {
ssgVertexArray *whl_vtx = new ssgVertexArray(WHL_BRANCH + 1);
ssgTexCoordArray *whl_tex = new ssgTexCoordArray(WHL_BRANCH + 1);
ssgColourArray *whl_clr = new ssgColourArray(1);
ssgNormalArray *whl_nrm = new ssgNormalArray(1);
clr[0] = 0.8f*colorfactor[k];
clr[1] = 0.8f*colorfactor[k];
clr[2] = 0.8f*colorfactor[k];
clr[3] = 1.0f;
whl_clr->add(clr);
whl_nrm->add(nrm);
vtx[0] = vtx[2] = 0.0;
vtx[1] = (float)(2 * k - 1) * car->_tireWidth(wheel_index) / 2.0 - b_offset;
whl_vtx->add(vtx);
tex[0] = 0.25 + toffset[j][0];
tex[1] = 0.25 + toffset[j][1];
whl_tex->add(tex);
vtx[1] = (float)(2 * k - 1) * car->_tireWidth(wheel_index) / 2.0;
for (i = 0; i < WHL_BRANCH; i++) {
alpha = (float)i * 2.0 * M_PI / (float)(WHL_BRANCH - 1);
vtx[0] = wheelRadius * cos(alpha);
vtx[2] = wheelRadius * sin(alpha);
whl_vtx->add(vtx);
tex[0] = 0.25 + 0.25 * cos(alpha) + toffset[j][0];
tex[1] = 0.25 + 0.25 * sin(alpha) + toffset[j][1];
whl_tex->add(tex);
}
ssgVtxTable *whl = new ssgVtxTable(GL_TRIANGLE_FAN, whl_vtx, whl_nrm, whl_tex, whl_clr);
whl->setState(grCarInfo[grCarIndex].wheelTexture);
whl->setCullFace(0);
// stripify rim, should improve performance
ssgStripify(whl);
whl_branch->addKid(whl);
// Swap normal for "inside" rim face.
nrm[1] *= -1.0;
}
nrm[1] = norm_orig;
}
whselector->addKid(whl_branch);
}
return wheel;
}
void
grInitCar(tCarElt *car)
{
const int BUFSIZE=4096;
char buf[BUFSIZE];
int index;
int selIndex;
ssgEntity *carEntity;
ssgSelector *LODSel;
ssgTransform *wheel[4];
int nranges;
int i, j;
void *handle;
const char *param;
int lg;
const int PATHSIZE=256;
char path[PATHSIZE];
myLoaderOptions options;
sgVec3 lightPos;
int lightNum;
const char *lightType;
int lightTypeNum;
if (!CarsAnchorTmp) {
CarsAnchorTmp = new ssgBranch();
}
grInitBoardCar(car);
TRACE_GL("loadcar: start");
ssgSetCurrentOptions ( &options ) ;
grCarIndex = index = car->index; /* current car's index */
handle = car->_carHandle;
/* Load visual attributes */
car->_exhaustNb = GfParmGetEltNb(handle, SECT_EXHAUST);
car->_exhaustNb = MIN(car->_exhaustNb, 2);
car->_exhaustPower = GfParmGetNum(handle, SECT_EXHAUST, PRM_POWER, NULL, 1.0);
for (i = 0; i < car->_exhaustNb; i++) {
snprintf(path, PATHSIZE, "%s/%d", SECT_EXHAUST, i + 1);
car->_exhaustPos[i].x = GfParmGetNum(handle, path, PRM_XPOS, NULL, -car->_dimension_x / 2.0);
car->_exhaustPos[i].y = -GfParmGetNum(handle, path, PRM_YPOS, NULL, car->_dimension_y / 2.0);
car->_exhaustPos[i].z = GfParmGetNum(handle, path, PRM_ZPOS, NULL, 0.1);
}
snprintf(path, PATHSIZE, "%s/%s", SECT_GROBJECTS, SECT_LIGHT);
lightNum = GfParmGetEltNb(handle, path);
for (i = 0; i < lightNum; i++) {
snprintf(path, PATHSIZE, "%s/%s/%d", SECT_GROBJECTS, SECT_LIGHT, i + 1);
lightPos[0] = GfParmGetNum(handle, path, PRM_XPOS, NULL, 0);
lightPos[1] = GfParmGetNum(handle, path, PRM_YPOS, NULL, 0);
lightPos[2] = GfParmGetNum(handle, path, PRM_ZPOS, NULL, 0);
lightType = GfParmGetStr(handle, path, PRM_TYPE, "");
lightTypeNum = LIGHT_NO_TYPE;
if (!strcmp(lightType, VAL_LIGHT_HEAD1)) {
lightTypeNum = LIGHT_TYPE_FRONT;
} else if (!strcmp(lightType, VAL_LIGHT_HEAD2)) {
lightTypeNum = LIGHT_TYPE_FRONT2;
} else if (!strcmp(lightType, VAL_LIGHT_BRAKE)) {
lightTypeNum = LIGHT_TYPE_BRAKE;
} else if (!strcmp(lightType, VAL_LIGHT_BRAKE2)) {
lightTypeNum = LIGHT_TYPE_BRAKE2;
} else if (!strcmp(lightType, VAL_LIGHT_REAR)) {
lightTypeNum = LIGHT_TYPE_REAR;
}
grAddCarlight(car, lightTypeNum, lightPos, GfParmGetNum(handle, path, PRM_SIZE, NULL, 0.2));
}
grLinkCarlights(car);
GfOut("[gr] Init(%d) car %s for driver %s index %d\n", index, car->_carName, car->_modName, car->_driverIndex);
grFilePath = (char*)malloc(BUFSIZE);
lg = 0;
lg += snprintf(grFilePath + lg, BUFSIZE - lg, "drivers/%s/%d/%s;", car->_modName, car->_driverIndex, car->_carName);
lg += snprintf(grFilePath + lg, BUFSIZE - lg, "drivers/%s/%d;", car->_modName, car->_driverIndex);
lg += snprintf(grFilePath + lg, BUFSIZE - lg, "drivers/%s/%s;", car->_modName, car->_carName);
lg += snprintf(grFilePath + lg, BUFSIZE - lg, "drivers/%s;", car->_modName);
lg += snprintf(grFilePath + lg, BUFSIZE - lg, "cars/%s", car->_carName);
param = GfParmGetStr(handle, SECT_GROBJECTS, PRM_WHEEL_TEXTURE, "");
if (strlen(param) != 0) {
grGammaValue = 1.8;
grMipMap = 0;
grCarInfo[index].wheelTexture = grSsgLoadTexState(param);
}
grCarInfo[index].envSelector = (ssgStateSelector*)grEnvSelector->clone();
grCarInfo[index].envSelector->ref();
/* the base transformation of the car (rotation + translation) */
grCarInfo[index].carTransform = new ssgTransform;
DBG_SET_NAME(grCarInfo[index].carTransform, car->_modName, index, -1);
/* Level of details */
grCarInfo[index].LODSelector = LODSel = new ssgSelector;
grCarInfo[index].carTransform->addKid(LODSel);
snprintf(path, PATHSIZE, "%s/%s", SECT_GROBJECTS, LST_RANGES);
nranges = GfParmGetEltNb(handle, path) + 1;
if (nranges < 2) {
GfOut("Error not enough levels of detail\n");
FREEZ(grFilePath);
return;
}
/* First LOD */
ssgBranch *carBody = new ssgBranch;
DBG_SET_NAME(carBody, "LOD", index, 0);
LODSel->addKid(carBody);
/* The car's model is under cars/<model> */
snprintf(buf, BUFSIZE, "cars/%s", car->_carName);
ssgModelPath(buf);
snprintf(buf, BUFSIZE, "drivers/%s/%d;drivers/%s;cars/%s", car->_modName, car->_driverIndex, car->_modName, car->_carName);
ssgTexturePath(buf);
grTexturePath = strdup(buf);
/* loading raw car level 0*/
selIndex = 0; /* current selector index */
snprintf(buf, BUFSIZE, "%s.ac", car->_carName); /* default car name */
snprintf(path, PATHSIZE, "%s/%s/1", SECT_GROBJECTS, LST_RANGES);
param = GfParmGetStr(handle, path, PRM_CAR, buf);
grCarInfo[index].LODThreshold[selIndex] = GfParmGetNum(handle, path, PRM_THRESHOLD, NULL, 0.0);
/*carEntity = ssgLoad(param);*/
carEntity = grssgCarLoadAC3D(param, NULL, index);
grCarInfo[index].carEntity = carEntity;
/* Set a selector on the driver */
char* stmp = strdup("DRIVER");
ssgBranch *b = (ssgBranch *)carEntity->getByName(stmp);
free(stmp);
grCarInfo[index].driverSelector = new ssgSelector;
if (b) {
ssgBranch *bp = b->getParent(0);
bp->addKid(grCarInfo[index].driverSelector);
grCarInfo[index].driverSelector->addKid(b);
bp->removeKid(b);
grCarInfo[index].driverSelector->select(1);
grCarInfo[index].driverSelectorinsg = true;
} else {
grCarInfo[index].driverSelectorinsg = false;
}
DBG_SET_NAME(carEntity, "Body", index, -1);
carBody->addKid(carEntity);
/* add wheels */
for (i = 0; i < 4; i++){
wheel[i] = initWheel(car, i);
carBody->addKid(wheel[i]);
}
grCarInfo[index].LODSelectMask[0] = 1 << selIndex; /* car mask */
selIndex++;
grCarInfo[index].sx=carTrackRatioX;
grCarInfo[index].sy=carTrackRatioY;
/* Other LODs */
for (i = 2; i < nranges; i++) {
carBody = new ssgBranch;
snprintf(buf, BUFSIZE, "%s/%s/%d", SECT_GROBJECTS, LST_RANGES, i);
param = GfParmGetStr(handle, buf, PRM_CAR, "");
grCarInfo[index].LODThreshold[selIndex] = GfParmGetNum(handle, buf, PRM_THRESHOLD, NULL, 0.0);
/* carEntity = ssgLoad(param); */
carEntity = grssgCarLoadAC3D(param, NULL, index);;
DBG_SET_NAME(carEntity, "LOD", index, i-1);
carBody->addKid(carEntity);
if (!strcmp(GfParmGetStr(handle, buf, PRM_WHEELSON, "no"), "yes")) {
/* add wheels */
for (j = 0; j < 4; j++){
carBody->addKid(wheel[j]);
}
}
LODSel->addKid(carBody);
grCarInfo[index].LODSelectMask[i-1] = 1 << selIndex; /* car mask */
selIndex++;
}
/* default range selection */
LODSel->select(grCarInfo[index].LODSelectMask[0]);
CarsAnchor->addKid(grCarInfo[index].carTransform);
//grCarInfo[index].carTransform->print(stdout, "-", 1);
FREEZ(grTexturePath);
FREEZ(grFilePath);
TRACE_GL("loadcar: end");
}
int
grLoadScene(tTrack *track)
{
void *hndl = grTrackHandle;
char *acname;
ssgEntity *desc;
char buf[256];
if (maxTextureUnits==0)
{
InitMultiTex();
}
ssgSetCurrentOptions(&options);
ssgAddTextureFormat(".png", grLoadPngTexture);
grRegisterCustomSGILoader();
grTrack = track;
TheScene = new ssgRoot;
/* Landscape */
LandAnchor = new ssgBranch;
TheScene->addKid(LandAnchor);
/* Pit stops walls */
PitsAnchor = new ssgBranch;
TheScene->addKid(PitsAnchor);
/* Skid Marks */
SkidAnchor = new ssgBranch;
TheScene->addKid(SkidAnchor);
/* Car shadows */
ShadowAnchor = new ssgBranch;
TheScene->addKid(ShadowAnchor);
/* Car lights */
CarlightAnchor = new ssgBranch;
TheScene->addKid(CarlightAnchor);
/* Cars */
CarsAnchor = new ssgBranch;
TheScene->addKid(CarsAnchor);
/* Smoke */
SmokeAnchor = new ssgBranch;
TheScene->addKid(SmokeAnchor);
/* Lens Flares */
SunAnchor = new ssgBranch;
TheScene->addKid(SunAnchor);
initBackground();
grWrldX = (int)(track->max.x - track->min.x + 1);
grWrldY = (int)(track->max.y - track->min.y + 1);
grWrldZ = (int)(track->max.z - track->min.z + 1);
grWrldMaxSize = (int)(MAX(MAX(grWrldX, grWrldY), grWrldZ));
acname = GfParmGetStr(hndl, TRK_SECT_GRAPH, TRK_ATT_3DDESC, "track.ac");
if (strlen(acname) == 0) {
return -1;
}
sprintf(buf, "tracks/%s/%s;data/textures;data/img;.", grTrack->category, grTrack->internalname);
ssgTexturePath(buf);
sprintf(buf, "tracks/%s/%s", grTrack->category, grTrack->internalname);
ssgModelPath(buf);
desc = grssgLoadAC3D(acname, NULL);
LandAnchor->addKid(desc);
return 0;
}
