Subversion Repositories Games.Carmageddon

#include "prepmesh.h"

#include "CORE/FW/brqsort.h"

#include "CORE/FW/diag.h"

#include "CORE/FW/resource.h"

#include "CORE/FW/scratch.h"

#include "CORE/MATH/angles.h"

#include "CORE/MATH/plane.h"

#include "CORE/MATH/vector.h"

#include "CORE/STD/brmath.h"

#include "CORE/STD/brstdlib.h"

#include "harness/hooks.h"

#include "harness/trace.h"

#include <assert.h>

br_model* compareModel;

char* pm_edge_scratch;

pm_temp_edge** pm_edge_hash;

int num_edges;

pm_temp_edge* pm_edge_table;

#define PREP_ALIGN(f) (f)

#define MODF_USES_DEFAULT 0x8000

// IDA: int __usercall addEdge@<EAX>(br_uint_16 first@<EAX>, br_uint_16 last@<EDX>)

int addEdge(br_uint_16 first, br_uint_16 last) {

    //pm_temp_edge* tep; // Pierre-Marie Baty -- unused variable

    LOG_TRACE("(%d, %d)", first, last);

    NOT_IMPLEMENTED();

}

// IDA: void __usercall prepareEdges(v11group *group@<EAX>, br_model *model@<EDX>)

void prepareEdges(v11group* group, br_model* model) {

    //br_size_t scratch_size; // Pierre-Marie Baty -- unused variable

    //br_face* mfp; // Pierre-Marie Baty -- unused variable

    //v11face* fp; // Pierre-Marie Baty -- unused variable

    //int f; // Pierre-Marie Baty -- unused variable

    LOG_TRACE("(%p, %p)", group, model);

    NOT_IMPLEMENTED();

}

// IDA: void __usercall BrPrepareEdges(br_model *model@<EAX>)

void BrPrepareEdges(br_model* model) {

    //int g; // Pierre-Marie Baty -- unused variable

    //v11model* v11m; // Pierre-Marie Baty -- unused variable

    LOG_TRACE("(%p)", model);

    NOT_IMPLEMENTED();

}

// IDA: int __cdecl FacesCompare(void *p1, void *p2)

int FacesCompare(const void* p1, const void* p2) {

    br_face* f1;

    br_face* f2;

    // LOG_TRACE9("(%p, %p)", p1, p2);

    f1 = *(br_face**)p1;

    f2 = *(br_face**)p2;

    if (f1->material > f2->material) {

        return 1;

    }

    if (f1->material < f2->material) {

        return -1;

    }

    return 0;

}

// IDA: int __cdecl TVCompare_XYZ(void *p1, void *p2)

int TVCompare_XYZ(const void* p1, const void* p2) {

    prep_vertex* tv1;

    prep_vertex* tv2;

    br_vertex* v1;

    br_vertex* v2;

    int i;

    // LOG_TRACE9("(%p, %p)", p1, p2);

    tv1 = *(prep_vertex**)p1;

    tv2 = *(prep_vertex**)p2;

    assert(compareModel != NULL);

    if (tv1->v == tv2->v)

        return 0;

    v1 = compareModel->vertices + tv1->v;

    v2 = compareModel->vertices + tv2->v;

    for (i = 0; i < 3; i++) {

        if (v1->p.v[i] > v2->p.v[i])

            return 1;

        if (v1->p.v[i] < v2->p.v[i])

            return -1;

    }

    return 0;

}

// IDA: int __cdecl TVCompare_MXYZUVN(void *p1, void *p2)

int TVCompare_MXYZUVN(const void* p1, const void* p2) {

    prep_vertex* tv1;

    prep_vertex* tv2;

    br_vertex* v1;

    br_vertex* v2;

    int i;

    // LOG_TRACE("(%p, %p)", p1, p2);

    tv1 = *(struct prep_vertex**)p1;

    tv2 = *(struct prep_vertex**)p2;

    assert(compareModel != NULL);

    if (compareModel->faces[tv1->f].material > compareModel->faces[tv2->f].material)

        return 1;

    if (compareModel->faces[tv1->f].material < compareModel->faces[tv2->f].material)

        return -1;

    if (tv1->v != tv2->v) {

        v1 = compareModel->vertices + tv1->v;

        v2 = compareModel->vertices + tv2->v;

        for (i = 0; i < 3; i++) {

            if (v1->p.v[i] > v2->p.v[i])

                return 1;

            if (v1->p.v[i] < v2->p.v[i])

                return -1;

        }

        for (i = 0; i < 2; i++) {

            if (v1->map.v[i] > v2->map.v[i])

                return 1;

            if (v1->map.v[i] < v2->map.v[i])

                return -1;

        }

    }

    for (i = 0; i < 3; i++) {

        if (tv1->n.v[i] > tv2->n.v[i])

            return 1;

        if (tv1->n.v[i] < tv2->n.v[i])

            return -1;

    }

    return 0;

}

// IDA: int __cdecl TVCompare_MVN(void *p1, void *p2)

int TVCompare_MVN(const void* p1, const void* p2) {

    prep_vertex* tv1;

    prep_vertex* tv2;

    int i;

    // LOG_TRACE9("(%p, %p)", p1, p2);

    tv1 = *(prep_vertex**)p1;

    tv2 = *(prep_vertex**)p2;

    // if (compareModel->faces[tv1->f].material != NULL) {

    //     LOG_DEBUG("%s, %s", compareModel->faces[tv1->f].material->identifier, compareModel->faces[tv2->f].material->identifier);

    // }

    if (compareModel->faces[tv1->f].material > compareModel->faces[tv2->f].material)

        return 1;

    if (compareModel->faces[tv1->f].material < compareModel->faces[tv2->f].material)

        return -1;

    if (tv1->v > tv2->v)

        return 1;

    if (tv1->v < tv2->v)

        return -1;

    for (i = 0; i < 3; i++) {

        if (tv1->n.v[i] > tv2->n.v[i])

            return 1;

        if (tv1->n.v[i] < tv2->n.v[i])

            return -1;

    }

    return 0;

}

// IDA: br_fraction __cdecl BrScalarToFractionClamp(br_scalar s)

br_fraction BrScalarToFractionClamp(br_scalar s) {

    if (s >= 1.0f) {

        return 1.0f;

    }

    if (s < -1.0f) {

        return -0.99999988f;

    }

    return s;

}

// IDA: void __usercall PrepareFaceNormals(br_model *model@<EAX>)

void PrepareFaceNormals(br_model* model) {

    //br_vertex* vertices; // Pierre-Marie Baty -- unused variable

    br_vector4 v4;

    br_face* fp;

    int f;

    for (f = 0; f < model->nfaces; f++) {

        fp = &model->faces[f];

        BrPlaneEquation(&v4, &model->vertices[fp->vertices[0]].p, &model->vertices[fp->vertices[1]].p, &model->vertices[fp->vertices[2]].p);

        fp->n.v[0] = BrScalarToFractionClamp(v4.v[0]);

        fp->n.v[1] = BrScalarToFractionClamp(v4.v[1]);

        fp->n.v[2] = BrScalarToFractionClamp(v4.v[2]);

        fp->d = v4.v[3];

    }

}

// IDA: void __usercall Smoothing(br_model *model@<EAX>, br_scalar crease_limit, prep_vertex **start, prep_vertex **end)

void Smoothing(br_model* model, br_scalar crease_limit, prep_vertex** start, prep_vertex** end) {

    prep_vertex** outer;

    prep_vertex** inner;

    LOG_TRACE9("(%p, %f, %p, %p)", model, crease_limit, start, end);

    for (outer = start; outer < end; outer++) {

        for (inner = start; inner < end; inner++) {

            if ((inner == outer) || (model->faces[(*outer)->f].smoothing & model->faces[(*inner)->f].smoothing)) {

                BrVector3Accumulate(&(*outer)->n, (br_vector3*)&model->faces[(*inner)->f].n);

            }

        }

    }

}

// IDA: void __usercall SmoothingCreased(br_model *model@<EAX>, br_scalar crease_limit, prep_vertex **start, prep_vertex **end)

void SmoothingCreased(br_model* model, br_scalar crease_limit, prep_vertex** start, prep_vertex** end) {

    br_vector3 o_n;

    prep_vertex** outer;

    prep_vertex** inner;

    LOG_TRACE9("(%p, %f, %p, %p)", model, crease_limit, start, end);

    for (outer = start; outer < end; outer++) {

        o_n.v[0] = model->faces[(*outer)->f].n.v[0];

        o_n.v[1] = model->faces[(*outer)->f].n.v[1];

        o_n.v[2] = model->faces[(*outer)->f].n.v[2];

        for (inner = start; inner < end; inner++) {

            if ((inner == outer) || ((model->faces[(*outer)->f].smoothing & model->faces[(*inner)->f].smoothing) && (BrVector3Dot((br_vector3*)&model->faces[(*inner)->f].n, &o_n) > crease_limit))) {

                BrVector3Accumulate(&(*outer)->n, (br_vector3*)&model->faces[(*inner)->f].n);

            }

        }

    }

}

// IDA: void __usercall CopyVertex(v11group *group@<EAX>, int v@<EDX>, prep_vertex *src@<EBX>, br_model *model@<ECX>)

void CopyVertex(v11group* group, int v, prep_vertex* src, br_model* model) {

    br_vertex* srcv;

    //br_vector3 n; // Pierre-Marie Baty -- unused variable

    LOG_TRACE9("(%p, %d, %p, %p)", group, v, src, model);

    srcv = model->vertices + src->v;

    BrVector3Sub(&group->vertices[v].p, &srcv->p, &model->pivot);

    group->vertices[v].map = srcv->map;

    BrVector3Normalise(&group->vertices[v].n, &src->n);

    group->vertex_colours[v] = BR_COLOUR_RGBA(srcv->red, srcv->grn, srcv->blu, srcv->index);

    group->vertex_user[v] = src->v;

}

// IDA: void __usercall CopyFace(v11group *group@<EAX>, int f@<EDX>, br_face *src@<EBX>, br_model *model@<ECX>)

void CopyFace(v11group* group, int f, br_face* src, br_model* model) {

    LOG_TRACE9("(%p, %d, %p, %p)", group, f, src, model);

    group->faces[f].vertices[0] = src->vertices[0];

    group->faces[f].vertices[1] = src->vertices[1];

    group->faces[f].vertices[2] = src->vertices[2];

    group->face_colours[f] = BR_COLOUR_RGBA(src->red, src->grn, src->blu, src->index);

    group->faces[f].eqn.v[0] = src->n.v[0];

    group->faces[f].eqn.v[1] = src->n.v[1];

    group->faces[f].eqn.v[2] = src->n.v[2];

    group->faces[f].eqn.v[3] = src->d;

    group->face_user[f] = src - model->faces;

}

// IDA: void __usercall PrepareGroups(br_model *model@<EAX>)

void PrepareGroups(br_model* model) {

    br_qsort_cbfn* vertex_compare_smoothing;

    br_qsort_cbfn* vertex_compare_groups;

    void (*smoothing_fn)(br_model*, br_scalar, prep_vertex**, prep_vertex**);

    //void* vp; // Pierre-Marie Baty -- unused variable

    br_size_t block_size;

    prep_vertex* temp_verts;

    prep_vertex* gtvp;

    prep_vertex** sorted_vertices;

    br_face* fp;

    int g;

    int f;

    int v;

    int i;

    int ntemps;

    int count;

    int nf;

    int nv;

    int ng;

    int old_count;

    br_scalar crease_limit;

    v11model* v11m;

    v11group* v11g;

    v11face* v11f;

    fmt_vertex* v11v;

    br_colour* v11fcolours;

    br_colour* v11vcolours;

    br_uint_16* v11fuser;

    br_uint_16* v11vuser;

    br_face** sorted_faces;

    char* cp;

    if (model->flags & BR_MODF_DONT_WELD) {

        vertex_compare_smoothing = TVCompare_XYZ;

        vertex_compare_groups = TVCompare_MVN;

    } else {

        vertex_compare_smoothing = TVCompare_XYZ;

        vertex_compare_groups = TVCompare_MXYZUVN;

    }

    if (model->flags & BR_MODF_CREASE) {

        crease_limit = BR_COS(model->crease_angle);

        smoothing_fn = SmoothingCreased;

    } else {

        crease_limit = BR_SCALAR(0.0);

        smoothing_fn = Smoothing;

    }

    compareModel = model;

    ntemps = model->nfaces * 3;

    block_size = ntemps * (sizeof(*temp_verts) + sizeof(*sorted_vertices)) + model->nfaces * sizeof(sorted_faces);

    temp_verts = BrScratchAllocate(block_size);

    BrMemSet(temp_verts, 0, block_size);

    sorted_vertices = (struct prep_vertex**)(temp_verts + ntemps);

    sorted_faces = (struct br_face**)(sorted_vertices + ntemps);

    gtvp = temp_verts;

    for (i = 0, f = 0, fp = model->faces; f < model->nfaces; f++, fp++) {

        sorted_faces[f] = fp;

        for (v = 0; v < 3; v++, i++, gtvp++) {

            if (model->flags & BR_MODF_CUSTOM_NORMALS) {

                TELL_ME_IF_WE_PASS_THIS_WAY();

                // gtvp->n.v[0] = model->vertices[fp->vertices[v]].n.v[0];

                // gtvp->n.v[1] = model->vertices[fp->vertices[v]].n.v[1];

                // gtvp->n.v[2] = model->vertices[fp->vertices[v]].n.v[2];

            }

            gtvp->v = fp->vertices[v];

            gtvp->f = f;

            sorted_vertices[i] = gtvp;

        }

        if (fp->smoothing == 0)

            fp->smoothing = (br_uint_16)~0;

    }

    BrQsort(sorted_faces, model->nfaces, sizeof(*sorted_faces), FacesCompare);

    if (!(model->flags & BR_MODF_CUSTOM_NORMALS)) {

        BrQsort(sorted_vertices, ntemps, sizeof(*sorted_vertices), vertex_compare_smoothing);

        for (v = 0, i = 0; v < ntemps - 1; v++) {

            if (vertex_compare_smoothing(sorted_vertices + v, sorted_vertices + v + 1)) {

                smoothing_fn(model, crease_limit, sorted_vertices + i, sorted_vertices + v + 1);

                i = v + 1;

            }

        }

        smoothing_fn(model, crease_limit, sorted_vertices + i, sorted_vertices + ntemps);

    }

    BrQsort(sorted_vertices, ntemps, sizeof(*sorted_vertices), vertex_compare_groups);

    for (v = 0, nv = 1; v < ntemps - 1; v++)

        if (vertex_compare_groups(sorted_vertices + v, sorted_vertices + v + 1))

            nv++;

    for (f = 1, ng = 1; f < model->nfaces; f++) {

        if (sorted_faces[f]->material != sorted_faces[f - 1]->material) {

            ng++;

        }

    }

    nf = model->nfaces;

    block_size = PREP_ALIGN(sizeof(struct v11model)) + PREP_ALIGN(ng * sizeof(struct v11group)) +

        PREP_ALIGN(nf * sizeof(*v11g->faces)) +

        PREP_ALIGN(nv * sizeof(*v11g->vertices)) +

        PREP_ALIGN(nf * sizeof(br_colour)) + PREP_ALIGN(nv * sizeof(br_colour)) + nv * sizeof(br_int_16) + nf * sizeof(br_int_16);

    if (model->prepared && block_size > ((struct v11model*)(model->prepared))->size) {

        BrResFree(model->prepared);

        model->prepared = NULL;

    }

    if (model->prepared == NULL) {

        model->prepared = BrResAllocate(model, block_size, BR_MEMORY_PREPARED_MODEL);

        ((struct v11model*)(model->prepared))->size = block_size;

    }

    cp = model->prepared;

    v11m = (void*)cp;

    cp += PREP_ALIGN(sizeof(struct v11model));

    v11g = (void*)cp;

    cp += PREP_ALIGN(ng * sizeof(struct v11group));

    v11f = (void*)cp;

    cp += PREP_ALIGN(nf * sizeof(struct v11face));

    v11v = (void*)cp;

    cp += PREP_ALIGN(nv * sizeof(struct fmt_vertex));

    v11vcolours = (void*)cp;

    cp += PREP_ALIGN(nv * sizeof(br_colour));

    v11fcolours = (void*)cp;

    cp += PREP_ALIGN(nf * sizeof(br_colour));

    v11vuser = (void*)cp;

    cp += nv * sizeof(br_uint_16);

    v11fuser = (void*)cp;

    cp += nf * sizeof(br_uint_16);

    v11m->groups = v11g;

    v11m->ngroups = ng;

    v11g[0].faces = v11f;

    v11g[0].face_colours = v11fcolours;

    v11g[0].face_user = v11fuser;

    v11g[0].stored = sorted_faces[0]->material ? sorted_faces[0]->material->stored : NULL;

    v11g[0].nfaces = 0;

    for (f = 0, g = 0; f < model->nfaces - 1; f++) {

        CopyFace(v11g + g, v11g[g].nfaces, sorted_faces[f], model);

        v11g[g].nfaces++;

        if (sorted_faces[f]->material != sorted_faces[f + 1]->material) {

            g++;

            v11g[g].faces = v11f + f + 1;

            v11g[g].face_colours = v11fcolours + f + 1;

            v11g[g].face_user = v11fuser + f + 1;

            v11g[g].stored = sorted_faces[f + 1]->material ? sorted_faces[f + 1]->material->stored : NULL;

            v11g[g].nfaces = 0;

        }

    }

    CopyFace(v11g + g, v11g[g].nfaces, sorted_faces[f], model);

    v11g[g].nfaces++;

    v11g[0].vertices = v11v;

    v11g[0].vertex_colours = v11vcolours;

    v11g[0].vertex_user = v11vuser;

    v11g[0].nvertices = 1;

    CopyVertex(v11g, 0, sorted_vertices[0], model);

    for (v = 0, g = 0, count = 0; v < ntemps - 1; v++) {

        if (model->faces[sorted_vertices[v]->f].material != model->faces[sorted_vertices[v + 1]->f].material) {

            g++;

            v11g[g].vertices = v11v + count + 1;

            v11g[g].vertex_colours = v11vcolours + count + 1;

            v11g[g].vertex_user = v11vuser + count + 1;

            v11g[g].nvertices = 0;

        }

        old_count = count;

        if (vertex_compare_groups(sorted_vertices + v, sorted_vertices + v + 1)) {

            count++;

            sorted_vertices[v]->v = count;

            CopyVertex(v11g + g, v11g[g].nvertices, sorted_vertices[v + 1], model);

            v11g[g].nvertices++;

        }

        sorted_vertices[v]->v = old_count;

    }

    sorted_vertices[v]->v = count;

    for (g = 0; g < ng; g++) {

        for (f = 0; f < v11g[g].nfaces; f++) {

            i = v11g[g].vertices - v11v;

            v = v11g[g].face_user[f] * 3;

            v11g[g].faces[f].vertices[0] = temp_verts[v + 0].v - i;

            v11g[g].faces[f].vertices[1] = temp_verts[v + 1].v - i;

            v11g[g].faces[f].vertices[2] = temp_verts[v + 2].v - i;

        }

    }

    BrScratchFree(temp_verts);

}

// IDA: void __usercall PrepareBoundingRadius(br_model *model@<EAX>)

void PrepareBoundingRadius(br_model* model) {

    float d;

    float max = 0.0f;

    int v;

    br_vertex* vp;

    for (v = 0; v < model->nvertices; v++) {

        vp = &model->vertices[v];

        d = vp->p.v[1] * vp->p.v[1] + vp->p.v[0] * vp->p.v[0] + vp->p.v[2] * vp->p.v[2];

        if (d > max) {

            max = d;

        }

    }

    model->radius = BrFloatSqrt(max);

}

// IDA: void __usercall PrepareBoundingBox(br_model *model@<EAX>)

void PrepareBoundingBox(br_model* model) {

    int axis;

    int v;

    br_vertex* vp;

    br_scalar x;

    vp = &model->vertices[0];

    for (axis = 0; axis < 3; axis++) {

        model->bounds.min.v[axis] = vp->p.v[axis];

        model->bounds.max.v[axis] = vp->p.v[axis];

    }

    for (v = 1; v < model->nvertices; v++) {

        vp = &model->vertices[v];

        for (axis = 0; axis < 3; axis++) {

            x = vp->p.v[axis];

            if (x > model->bounds.max.v[axis]) {

                model->bounds.max.v[axis] = x;

            }

            if (x < model->bounds.min.v[axis]) {

                model->bounds.min.v[axis] = x;

            }

        }

    }

}

// IDA: void __usercall RegenerateFaceNormals(v11model *v11m@<EAX>)

void RegenerateFaceNormals(v11model* v11m) {

    int g;

    int f;

    v11face* fp;

    LOG_TRACE("(%p)", v11m);

    for (g = 0; g < v11m->ngroups; g++) {

        for (f = 0; f < v11m->groups[g].nfaces; f++) {

            fp = &v11m->groups[g].faces[f];

            BrPlaneEquation(&fp->eqn,

                &v11m->groups->vertices[fp->vertices[0]].p,

                &v11m->groups->vertices[fp->vertices[1]].p,

                &v11m->groups->vertices[fp->vertices[2]].p);

        }

    }

}

// IDA: void __usercall RegenerateVertexNormals(v11model *v11m@<EAX>)

void RegenerateVertexNormals(v11model* v11m) {

    int g;

    int v;

    int f;

    v11face* fp;

    fmt_vertex* vp;

    br_vector3* normals;

    LOG_TRACE("(%p)", v11m);

    for (g = 0; g < v11m->ngroups; g++) {

        normals = BrScratchAllocate(v11m->groups[g].nvertices * sizeof(br_vector3));

        BrMemSet(normals, 0, v11m->groups[g].nvertices * sizeof(br_vector3));

        for (f = 0; f < v11m->groups[g].nfaces; f++) {

            fp = &v11m->groups[g].faces[f];

            normals[fp->vertices[0]].v[0] += fp->eqn.v[0];

            normals[fp->vertices[0]].v[1] += fp->eqn.v[1];

            normals[fp->vertices[0]].v[2] += fp->eqn.v[2];

            normals[fp->vertices[1]].v[0] += fp->eqn.v[0];

            normals[fp->vertices[1]].v[1] += fp->eqn.v[1];

            normals[fp->vertices[1]].v[2] += fp->eqn.v[2];

            normals[fp->vertices[2]].v[0] += fp->eqn.v[0];

            normals[fp->vertices[2]].v[1] += fp->eqn.v[1];

            normals[fp->vertices[2]].v[2] += fp->eqn.v[2];

        }

        for (v = 0; v < v11m->groups[g].nvertices; v++) {

            vp = &v11m->groups[g].vertices[v];

            // FIXME: use inlined variant? BR_VECTOR3_NORMALISE (unsure about exact naming)

            BrVector3Normalise(&vp->n, &normals[v]);

        }

        BrScratchFree(normals);

    }

}

// IDA: void __cdecl BrModelUpdate(br_model *model, br_uint_16 flags)

void BrModelUpdate(br_model* model, br_uint_16 flags) {

    int g;

    int f;

    int v;

    v11model* v11m;

    fmt_vertex* fvp;

    //v11face* ffp; // Pierre-Marie Baty -- unused variable

    br_vertex* vp;

    br_face* fp;

    LOG_TRACE("(%p, %d)", model, flags);

    if (model->flags & BR_MODF_PREPREPARED) {

        return;

    }

    if (model->faces == NULL || model->vertices == NULL) {

        BrFailure("BrModelUpdate: model has no faces or vertices (%s)", model->identifier != NULL ? model->identifier : "<NULL>");

    }

    if (flags & BR_MODU_PIVOT) {

        flags |= BR_MODU_VERTEX_POSITIONS;

    }

    if (model->flags & (BR_MODF_KEEP_ORIGINAL | BR_MODF_GENERATE_TAGS)) {

        model->flags |= BR_MODF_UPDATEABLE;

    }

    if (!(model->flags & BR_MODF_CUSTOM_BOUNDS) && (flags & (BR_MODU_PRIMITIVE_COLOURS | BR_MODU_VERTEX_NORMALS | BR_MODU_VERTEX_POSITIONS))) {

        PrepareBoundingRadius(model);

        PrepareBoundingBox(model);

    }

    if (!model->prepared || flags & 0xFFD0) {

        if (!model->faces || !model->vertices) {

            return;

        }

        PrepareFaceNormals(model);

        f = 0;

        fp = model->faces;

        model->flags &= ~MODF_USES_DEFAULT;

        for (f = 0; f < model->nfaces; f++) {

            fp = &model->faces[f];

            if (!fp->material) {

                model->flags |= MODF_USES_DEFAULT;

            }

            for (v = 0; v < 3; v++) {

                if (fp->vertices[v] >= model->nvertices) {

                    BrFailure("face references invalid vertex f=%d v=%d", f, v);

                }

            }

        }

        PrepareGroups(model);

        v11m = model->prepared;

        if (v11m) {

            for (g = 0; g < v11m->ngroups; g++) {

                // prepareEdges(&v11m->groups[g], model);

            }

        } else {

            LOG_DEBUG("has prepared model FALSE");

        }

    } else {

        // some additional code paths might exist, but maybe not used?

        if (flags != BR_MODU_VERTEX_POSITIONS) {

            TELL_ME_IF_WE_PASS_THIS_WAY();

        }

        v11m = model->prepared;

        if (model->vertices && (flags & BR_MODU_VERTEX_POSITIONS)) {

            for (g = 0; g < v11m->ngroups; g++) {

                for (v = 0; v < v11m->groups[g].nvertices; v++) {

                    fvp = &v11m->groups[g].vertices[v];

                    vp = model->vertices + v11m->groups[g].vertex_user[v];

                    if (flags & BR_MODU_VERTEX_POSITIONS) {

                        fvp->p.v[0] = vp->p.v[0] - model->pivot.v[0];

                        fvp->p.v[1] = vp->p.v[1] - model->pivot.v[1];

                        fvp->p.v[2] = vp->p.v[2] - model->pivot.v[2];

                    }

                }

            }

        }

        if (flags & BR_MODU_VERTEX_POSITIONS) {