std::shared_ptr<GonioPhotometricLight> CreateGoniometricLight(
const Transform &light2world, const Medium *medium,
const ParamSet ¶mSet) {
Spectrum I = paramSet.FindOneSpectrum("I", Spectrum(1.0));
Spectrum sc = paramSet.FindOneSpectrum("scale", Spectrum(1.0));
std::string texname = paramSet.FindOneFilename("mapname", "");
return std::make_shared<GonioPhotometricLight>(light2world, medium, I * sc,
texname);
}
std::shared_ptr<ProjectionLight> CreateProjectionLight(
const Transform &light2world, const Medium *medium,
const ParamSet ¶mSet) {
Spectrum I = paramSet.FindOneSpectrum("I", Spectrum(1.0));
Spectrum sc = paramSet.FindOneSpectrum("scale", Spectrum(1.0));
Float fov = paramSet.FindOneFloat("fov", 45.);
std::string texname = paramSet.FindOneFilename("mapname", "");
return std::make_shared<ProjectionLight>(light2world, medium, I * sc,
texname, fov);
}
std::shared_ptr<InfiniteAreaLight> CreateInfiniteLight(
const Transform &light2world, const ParamSet ¶mSet) {
Spectrum L = paramSet.FindOneSpectrum("L", Spectrum(1.0));
Spectrum sc = paramSet.FindOneSpectrum("scale", Spectrum(1.0));
std::string texmap = paramSet.FindOneFilename("mapname", "");
int nSamples = paramSet.FindOneInt("nsamples", 1);
if (PbrtOptions.quickRender) nSamples = std::max(1, nSamples / 4);
return std::make_shared<InfiniteAreaLight>(light2world, L * sc, nSamples,
texmap);
}
std::vector<std::shared_ptr<Shape>> CreatePLYMesh(
const Transform *o2w, const Transform *w2o, bool reverseOrientation,
const ParamSet ¶ms,
std::map<std::string, std::shared_ptr<Texture<Float>>> *floatTextures) {
const std::string filename = params.FindOneFilename("filename", "");
p_ply ply = ply_open(filename.c_str(), rply_message_callback, 0, nullptr);
if (!ply) {
Error("Couldn't open PLY file \"%s\"", filename.c_str());
return std::vector<std::shared_ptr<Shape>>();
}
if (!ply_read_header(ply)) {
Error("Unable to read the header of PLY file \"%s\"", filename.c_str());
return std::vector<std::shared_ptr<Shape>>();
}
p_ply_element element = nullptr;
long vertexCount = 0, faceCount = 0;
/* Inspect the structure of the PLY file */
while ((element = ply_get_next_element(ply, element)) != nullptr) {
const char *name;
long nInstances;
ply_get_element_info(element, &name, &nInstances);
if (!strcmp(name, "vertex"))
vertexCount = nInstances;
else if (!strcmp(name, "face"))
faceCount = nInstances;
}
if (vertexCount == 0 || faceCount == 0) {
Error("PLY file \"%s\" is invalid! No face/vertex elements found!",
filename.c_str());
return std::vector<std::shared_ptr<Shape>>();
}
CallbackContext context;
if (ply_set_read_cb(ply, "vertex", "x", rply_vertex_callback, &context,
0x030) &&
ply_set_read_cb(ply, "vertex", "y", rply_vertex_callback, &context,
0x031) &&
ply_set_read_cb(ply, "vertex", "z", rply_vertex_callback, &context,
0x032)) {
context.p = new Point3f[vertexCount];
} else {
Error("PLY file \"%s\": Vertex coordinate property not found!",
filename.c_str());
return std::vector<std::shared_ptr<Shape>>();
}
if (ply_set_read_cb(ply, "vertex", "nx", rply_vertex_callback, &context,
0x130) &&
ply_set_read_cb(ply, "vertex", "ny", rply_vertex_callback, &context,
0x131) &&
ply_set_read_cb(ply, "vertex", "nz", rply_vertex_callback, &context,
0x132))
context.n = new Normal3f[vertexCount];
/* There seem to be lots of different conventions regarding UV coordinate
* names */
if ((ply_set_read_cb(ply, "vertex", "u", rply_vertex_callback, &context,
0x220) &&
ply_set_read_cb(ply, "vertex", "v", rply_vertex_callback, &context,
0x221)) ||
(ply_set_read_cb(ply, "vertex", "s", rply_vertex_callback, &context,
0x220) &&
ply_set_read_cb(ply, "vertex", "t", rply_vertex_callback, &context,
0x221)) ||
(ply_set_read_cb(ply, "vertex", "texture_u", rply_vertex_callback,
&context, 0x220) &&
ply_set_read_cb(ply, "vertex", "texture_v", rply_vertex_callback,
&context, 0x221)) ||
(ply_set_read_cb(ply, "vertex", "texture_s", rply_vertex_callback,
&context, 0x220) &&
ply_set_read_cb(ply, "vertex", "texture_t", rply_vertex_callback,
&context, 0x221)))
context.uv = new Point2f[vertexCount];
/* Allocate enough space in case all faces are quads */
context.indices = new int[faceCount * 6];
context.vertexCount = vertexCount;
ply_set_read_cb(ply, "face", "vertex_indices", rply_face_callback, &context,
0);
if (!ply_read(ply)) {
Error("Unable to read the contents of PLY file \"%s\"",
filename.c_str());
ply_close(ply);
return std::vector<std::shared_ptr<Shape>>();
}
ply_close(ply);
if (context.error) return std::vector<std::shared_ptr<Shape>>();
// Look up an alpha texture, if applicable
std::shared_ptr<Texture<Float>> alphaTex;
std::string alphaTexName = params.FindTexture("alpha");
if (alphaTexName != "") {
if (floatTextures->find(alphaTexName) != floatTextures->end())
alphaTex = (*floatTextures)[alphaTexName];
else
Error("Couldn't find float texture \"%s\" for \"alpha\" parameter",
alphaTexName.c_str());
} else if (params.FindOneFloat("alpha", 1.f) == 0.f) {
alphaTex.reset(new ConstantTexture<Float>(0.f));
}
std::shared_ptr<Texture<Float>> shadowAlphaTex;
std::string shadowAlphaTexName = params.FindTexture("shadowalpha");
if (shadowAlphaTexName != "") {
if (floatTextures->find(shadowAlphaTexName) != floatTextures->end())
shadowAlphaTex = (*floatTextures)[shadowAlphaTexName];
else
Error("Couldn't find float texture \"%s\" for \"shadowalpha\" parameter",
shadowAlphaTexName.c_str());
} else if (params.FindOneFloat("shadowalpha", 1.f) == 0.f)
shadowAlphaTex.reset(new ConstantTexture<Float>(0.f));
bool discardDegenerateUVs =
params.FindOneBool("discarddegenerateUVs", false);
if (discardDegenerateUVs && context.uv && context.n) {
// if there are normals, check for bad uv's that
// give degenerate mappings; discard them if so
const int *vp = context.indices;
const Point3f *P = context.p;
const Point2f *uv = context.uv;
for (int i = 0; i < context.indexCtr; i += 3, vp += 3) {
Float area =
.5f * Cross(P[vp[0]] - P[vp[1]], P[vp[2]] - P[vp[1]]).Length();
if (area < 1e-7) continue; // ignore degenerate tris.
if ((uv[vp[0]].x == uv[vp[1]].x && uv[vp[0]].y == uv[vp[1]].y) ||
(uv[vp[1]].x == uv[vp[2]].x && uv[vp[1]].y == uv[vp[2]].y) ||
(uv[vp[2]].x == uv[vp[0]].x && uv[vp[2]].y == uv[vp[0]].y)) {
Warning(
"Degenerate uv coordinates in triangle mesh. Discarding "
"all uv.");
delete[] context.uv;
context.uv = nullptr;
break;
}
}
}
return CreateTriangleMesh(
o2w, w2o, reverseOrientation, context.indexCtr / 3, context.indices,
vertexCount, context.p, nullptr, context.n, context.uv, alphaTex,
shadowAlphaTex);
}
std::vector<std::shared_ptr<Shape>> CreatePLYMesh(
const Transform *o2w, const Transform *w2o, bool reverseOrientation,
const ParamSet ¶ms,
std::map<std::string, std::shared_ptr<Texture<Float>>> *floatTextures) {
const std::string filename = params.FindOneFilename("filename", "");
p_ply ply = ply_open(filename.c_str(), rply_message_callback, 0, nullptr);
if (!ply) {
Error("Couldn't open PLY file \"%s\"", filename.c_str());
return std::vector<std::shared_ptr<Shape>>();
}
if (!ply_read_header(ply)) {
Error("Unable to read the header of PLY file \"%s\"", filename.c_str());
return std::vector<std::shared_ptr<Shape>>();
}
p_ply_element element = nullptr;
long vertexCount = 0, faceCount = 0;
/* Inspect the structure of the PLY file */
while ((element = ply_get_next_element(ply, element)) != nullptr) {
const char *name;
long nInstances;
ply_get_element_info(element, &name, &nInstances);
if (!strcmp(name, "vertex"))
vertexCount = nInstances;
else if (!strcmp(name, "face"))
faceCount = nInstances;
}
if (vertexCount == 0 || faceCount == 0) {
Error("PLY file \"%s\" is invalid! No face/vertex elements found!",
filename.c_str());
return std::vector<std::shared_ptr<Shape>>();
}
CallbackContext context;
if (ply_set_read_cb(ply, "vertex", "x", rply_vertex_callback, &context,
0x030) &&
ply_set_read_cb(ply, "vertex", "y", rply_vertex_callback, &context,
0x031) &&
ply_set_read_cb(ply, "vertex", "z", rply_vertex_callback, &context,
0x032)) {
context.p = new Point3f[vertexCount];
} else {
Error("PLY file \"%s\": Vertex coordinate property not found!",
filename.c_str());
return std::vector<std::shared_ptr<Shape>>();
}
if (ply_set_read_cb(ply, "vertex", "nx", rply_vertex_callback, &context,
0x130) &&
ply_set_read_cb(ply, "vertex", "ny", rply_vertex_callback, &context,
0x131) &&
ply_set_read_cb(ply, "vertex", "nz", rply_vertex_callback, &context,
0x132))
context.n = new Normal3f[vertexCount];
/* There seem to be lots of different conventions regarding UV coordinate
* names */
if ((ply_set_read_cb(ply, "vertex", "u", rply_vertex_callback, &context,
0x220) &&
ply_set_read_cb(ply, "vertex", "v", rply_vertex_callback, &context,
0x221)) ||
(ply_set_read_cb(ply, "vertex", "s", rply_vertex_callback, &context,
0x220) &&
ply_set_read_cb(ply, "vertex", "t", rply_vertex_callback, &context,
0x221)) ||
(ply_set_read_cb(ply, "vertex", "texture_u", rply_vertex_callback,
&context, 0x220) &&
ply_set_read_cb(ply, "vertex", "texture_v", rply_vertex_callback,
&context, 0x221)) ||
(ply_set_read_cb(ply, "vertex", "texture_s", rply_vertex_callback,
&context, 0x220) &&
ply_set_read_cb(ply, "vertex", "texture_t", rply_vertex_callback,
&context, 0x221)))
context.uv = new Point2f[vertexCount];
/* Allocate enough space in case all faces are quads */
context.indices = new int[faceCount * 6];
context.vertexCount = vertexCount;
ply_set_read_cb(ply, "face", "vertex_indices", rply_face_callback, &context,
0);
if (!ply_read(ply)) {
Error("Unable to read the contents of PLY file \"%s\"",
filename.c_str());
ply_close(ply);
return std::vector<std::shared_ptr<Shape>>();
}
ply_close(ply);
if (context.error) return std::vector<std::shared_ptr<Shape>>();
// Look up an alpha texture, if applicable
std::shared_ptr<Texture<Float>> alphaTex;
std::string alphaTexName = params.FindTexture("alpha");
if (alphaTexName != "") {
if (floatTextures->find(alphaTexName) != floatTextures->end())
alphaTex = (*floatTextures)[alphaTexName];
else
Error("Couldn't find float texture \"%s\" for \"alpha\" parameter",
alphaTexName.c_str());
} else if (params.FindOneFloat("alpha", 1.f) == 0.f) {
alphaTex.reset(new ConstantTexture<Float>(0.f));
}
std::shared_ptr<Texture<Float>> shadowAlphaTex;
std::string shadowAlphaTexName = params.FindTexture("shadowalpha");
if (shadowAlphaTexName != "") {
if (floatTextures->find(shadowAlphaTexName) != floatTextures->end())
shadowAlphaTex = (*floatTextures)[shadowAlphaTexName];
else
Error(
"Couldn't find float texture \"%s\" for \"shadowalpha\" "
"parameter",
shadowAlphaTexName.c_str());
} else if (params.FindOneFloat("shadowalpha", 1.f) == 0.f)
shadowAlphaTex.reset(new ConstantTexture<Float>(0.f));
return CreateTriangleMesh(o2w, w2o, reverseOrientation,
context.indexCtr / 3, context.indices,
vertexCount, context.p, nullptr, context.n,
context.uv, alphaTex, shadowAlphaTex);
}
