void json_set_value(const jsonvalue& json, frame3f& value) {
value = identity_frame3f;
if(json.object_contains("from") or json.object_contains("to") or json.object_contains("up")) {
auto from = z3f, to = zero3f, up = y3f;
if(json.object_contains("from")) json_set_value(json.object_element("from"), from);
if(json.object_contains("to")) json_set_value(json.object_element("to"), to);
if(json.object_contains("up")) json_set_value(json.object_element("up"), up);
value = lookat_frame(from, to, up);
} else {
if(json.object_contains("o")) json_set_value(json.object_element("o"), value.o);
if(json.object_contains("x")) json_set_value(json.object_element("x"), value.x);
if(json.object_contains("y")) json_set_value(json.object_element("y"), value.y);
if(json.object_contains("z")) json_set_value(json.object_element("z"), value.z);
value = orthonormalize_zyx(value);
}
}
void json_parse_opttexture(jsonvalue json, image3f*& txt, string name) {
if(not json.object_contains(name)) return;
auto filename = json.object_element(name).as_string();
if(filename.empty()) { txt = nullptr; return; }
auto dirname = json_texture_paths.back();
auto fullname = dirname + filename;
if (json_texture_cache.find(fullname) == json_texture_cache.end()) {
auto ext = fullname.substr(fullname.size()-3);
if(ext == "pfm") {
auto image = read_pnm("models/pisa_latlong.pfm", true);
image = image.gamma(1/2.2);
json_texture_cache[fullname] = new image3f(image);
} else if(ext == "png") {
auto image = read_png(fullname,true);
json_texture_cache[fullname] = new image3f(image);
} else error("unsupported image format %s\n", ext.c_str());
}
txt = json_texture_cache[fullname];
}
void json_set_optvalue(const jsonvalue& json, T& value, const string& name) {
if(not json.object_contains(name)) return;
json_set_value(json.object_element(name), value);
}
