diff options
Diffstat (limited to 'source/blender/io/usd/intern/usd_reader_material.cc')
| -rw-r--r-- | source/blender/io/usd/intern/usd_reader_material.cc | 703 |
1 files changed, 703 insertions, 0 deletions
diff --git a/source/blender/io/usd/intern/usd_reader_material.cc b/source/blender/io/usd/intern/usd_reader_material.cc new file mode 100644 index 00000000000..02ed7c35e57 --- /dev/null +++ b/source/blender/io/usd/intern/usd_reader_material.cc @@ -0,0 +1,703 @@ +/* + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * The Original Code is Copyright (C) 2021 NVIDIA Corporation. + * All rights reserved. + */ + +#include "usd_reader_material.h" + +#include "BKE_image.h" +#include "BKE_main.h" +#include "BKE_material.h" +#include "BKE_node.h" + +#include "BLI_math_vector.h" +#include "BLI_string.h" + +#include "DNA_material_types.h" + +#include <pxr/base/gf/vec3f.h> +#include <pxr/usd/usdShade/material.h> +#include <pxr/usd/usdShade/shader.h> + +#include <iostream> +#include <vector> + +namespace usdtokens { + +/* Parameter names. */ +static const pxr::TfToken a("a", pxr::TfToken::Immortal); +static const pxr::TfToken b("b", pxr::TfToken::Immortal); +static const pxr::TfToken clearcoat("clearcoat", pxr::TfToken::Immortal); +static const pxr::TfToken clearcoatRoughness("clearcoatRoughness", pxr::TfToken::Immortal); +static const pxr::TfToken diffuseColor("diffuseColor", pxr::TfToken::Immortal); +static const pxr::TfToken emissiveColor("emissiveColor", pxr::TfToken::Immortal); +static const pxr::TfToken file("file", pxr::TfToken::Immortal); +static const pxr::TfToken g("g", pxr::TfToken::Immortal); +static const pxr::TfToken ior("ior", pxr::TfToken::Immortal); +static const pxr::TfToken metallic("metallic", pxr::TfToken::Immortal); +static const pxr::TfToken normal("normal", pxr::TfToken::Immortal); +static const pxr::TfToken occlusion("occlusion", pxr::TfToken::Immortal); +static const pxr::TfToken opacity("opacity", pxr::TfToken::Immortal); +static const pxr::TfToken opacityThreshold("opacityThreshold", pxr::TfToken::Immortal); +static const pxr::TfToken r("r", pxr::TfToken::Immortal); +static const pxr::TfToken result("result", pxr::TfToken::Immortal); +static const pxr::TfToken rgb("rgb", pxr::TfToken::Immortal); +static const pxr::TfToken rgba("rgba", pxr::TfToken::Immortal); +static const pxr::TfToken roughness("roughness", pxr::TfToken::Immortal); +static const pxr::TfToken sourceColorSpace("sourceColorSpace", pxr::TfToken::Immortal); +static const pxr::TfToken specularColor("specularColor", pxr::TfToken::Immortal); +static const pxr::TfToken st("st", pxr::TfToken::Immortal); +static const pxr::TfToken varname("varname", pxr::TfToken::Immortal); + +/* Color space names. */ +static const pxr::TfToken raw("raw", pxr::TfToken::Immortal); +static const pxr::TfToken RAW("RAW", pxr::TfToken::Immortal); + +/* USD shader names. */ +static const pxr::TfToken UsdPreviewSurface("UsdPreviewSurface", pxr::TfToken::Immortal); +static const pxr::TfToken UsdPrimvarReader_float2("UsdPrimvarReader_float2", + pxr::TfToken::Immortal); +static const pxr::TfToken UsdUVTexture("UsdUVTexture", pxr::TfToken::Immortal); +} // namespace usdtokens + +/* Add a node of the given type at the given location coordinates. */ +static bNode *add_node( + const bContext *C, bNodeTree *ntree, const int type, const float locx, const float locy) +{ + bNode *new_node = nodeAddStaticNode(C, ntree, type); + + if (new_node) { + new_node->locx = locx; + new_node->locy = locy; + } + + return new_node; +} + +/* Connect the output socket of node 'source' to the input socket of node 'dest'. */ +static void link_nodes( + bNodeTree *ntree, bNode *source, const char *sock_out, bNode *dest, const char *sock_in) +{ + bNodeSocket *source_socket = nodeFindSocket(source, SOCK_OUT, sock_out); + + if (!source_socket) { + std::cerr << "PROGRAMMER ERROR: Couldn't find output socket " << sock_out << std::endl; + return; + } + + bNodeSocket *dest_socket = nodeFindSocket(dest, SOCK_IN, sock_in); + + if (!dest_socket) { + std::cerr << "PROGRAMMER ERROR: Couldn't find input socket " << sock_in << std::endl; + return; + } + + nodeAddLink(ntree, source, source_socket, dest, dest_socket); +} + +/* Returns true if the given shader may have opacity < 1.0, based + * on heuristics. */ +static bool needs_blend(const pxr::UsdShadeShader &usd_shader) +{ + if (!usd_shader) { + return false; + } + + bool needs_blend = false; + + if (pxr::UsdShadeInput opacity_input = usd_shader.GetInput(usdtokens::opacity)) { + + if (opacity_input.HasConnectedSource()) { + needs_blend = true; + } + else { + pxr::VtValue val; + if (opacity_input.GetAttr().HasAuthoredValue() && opacity_input.GetAttr().Get(&val)) { + float opacity = val.Get<float>(); + needs_blend = opacity < 1.0f; + } + } + } + + return needs_blend; +} + +/* Returns the given shader's opacityThreshold input value, if this input has an + * authored value. Otherwise, returns the given default value. */ +static float get_opacity_threshold(const pxr::UsdShadeShader &usd_shader, + float default_value = 0.0f) +{ + if (!usd_shader) { + return default_value; + } + + pxr::UsdShadeInput opacity_threshold_input = usd_shader.GetInput(usdtokens::opacityThreshold); + + if (!opacity_threshold_input) { + return default_value; + } + + pxr::VtValue val; + if (opacity_threshold_input.GetAttr().HasAuthoredValue() && + opacity_threshold_input.GetAttr().Get(&val)) { + return val.Get<float>(); + } + + return default_value; +} + +static pxr::TfToken get_source_color_space(const pxr::UsdShadeShader &usd_shader) +{ + if (!usd_shader) { + return pxr::TfToken(); + } + + pxr::UsdShadeInput color_space_input = usd_shader.GetInput(usdtokens::sourceColorSpace); + + if (!color_space_input) { + return pxr::TfToken(); + } + + pxr::VtValue color_space_val; + if (color_space_input.Get(&color_space_val) && color_space_val.IsHolding<pxr::TfToken>()) { + return color_space_val.Get<pxr::TfToken>(); + } + + return pxr::TfToken(); +} + +/* Attempts to return in r_preview_surface the UsdPreviewSurface shader source + * of the given material. Returns true if a UsdPreviewSurface source was found + * and returns false otherwise. */ +static bool get_usd_preview_surface(const pxr::UsdShadeMaterial &usd_material, + pxr::UsdShadeShader &r_preview_surface) +{ + if (!usd_material) { + return false; + } + + if (pxr::UsdShadeShader surf_shader = usd_material.ComputeSurfaceSource()) { + /* Check if we have a UsdPreviewSurface shader. */ + pxr::TfToken shader_id; + if (surf_shader.GetShaderId(&shader_id) && shader_id == usdtokens::UsdPreviewSurface) { + r_preview_surface = surf_shader; + return true; + } + } + + return false; +} + +/* Set the Blender material's viewport display color, metallic and roughness + * properties from the given USD preview surface shader's inputs. */ +static void set_viewport_material_props(Material *mtl, const pxr::UsdShadeShader &usd_preview) +{ + if (!(mtl && usd_preview)) { + return; + } + + if (pxr::UsdShadeInput diffuse_color_input = usd_preview.GetInput(usdtokens::diffuseColor)) { + pxr::VtValue val; + if (diffuse_color_input.GetAttr().HasAuthoredValue() && + diffuse_color_input.GetAttr().Get(&val) && val.IsHolding<pxr::GfVec3f>()) { + pxr::GfVec3f color = val.UncheckedGet<pxr::GfVec3f>(); + mtl->r = color[0]; + mtl->g = color[1]; + mtl->b = color[2]; + } + } + + if (pxr::UsdShadeInput metallic_input = usd_preview.GetInput(usdtokens::metallic)) { + pxr::VtValue val; + if (metallic_input.GetAttr().HasAuthoredValue() && metallic_input.GetAttr().Get(&val) && + val.IsHolding<float>()) { + mtl->metallic = val.Get<float>(); + } + } + + if (pxr::UsdShadeInput roughness_input = usd_preview.GetInput(usdtokens::roughness)) { + pxr::VtValue val; + if (roughness_input.GetAttr().HasAuthoredValue() && roughness_input.GetAttr().Get(&val) && + val.IsHolding<float>()) { + mtl->roughness = val.Get<float>(); + } + } +} + +namespace blender::io::usd { + +namespace { + +/* Compute the x- and y-coordinates for placing a new node in an unoccupied region of + * the column with the given index. Returns the coordinates in r_locx and r_locy and + * updates the column-occupancy information in r_ctx. */ +void compute_node_loc(const int column, float *r_locx, float *r_locy, NodePlacementContext *r_ctx) +{ + if (!(r_locx && r_locy && r_ctx)) { + return; + } + + (*r_locx) = r_ctx->origx - column * r_ctx->horizontal_step; + + if (column >= r_ctx->column_offsets.size()) { + r_ctx->column_offsets.push_back(0.0f); + } + + (*r_locy) = r_ctx->origy - r_ctx->column_offsets[column]; + + /* Record the y-offset of the occupied region in + * the column, including padding. */ + r_ctx->column_offsets[column] += r_ctx->vertical_step + 10.0f; +} + +} // End anonymous namespace. + +USDMaterialReader::USDMaterialReader(const USDImportParams ¶ms, Main *bmain) + : params_(params), bmain_(bmain) +{ +} + +Material *USDMaterialReader::add_material(const pxr::UsdShadeMaterial &usd_material) const +{ + if (!(bmain_ && usd_material)) { + return nullptr; + } + + std::string mtl_name = usd_material.GetPrim().GetName().GetString(); + + /* Create the material. */ + Material *mtl = BKE_material_add(bmain_, mtl_name.c_str()); + + /* Get the UsdPreviewSurface shader source for the material, + * if there is one. */ + pxr::UsdShadeShader usd_preview; + if (get_usd_preview_surface(usd_material, usd_preview)) { + + set_viewport_material_props(mtl, usd_preview); + + /* Optionally, create shader nodes to represent a UsdPreviewSurface. */ + if (params_.import_usd_preview) { + import_usd_preview(mtl, usd_preview); + } + } + + return mtl; +} + +/* Create the Principled BSDF shader node network. */ +void USDMaterialReader::import_usd_preview(Material *mtl, + const pxr::UsdShadeShader &usd_shader) const +{ + if (!(bmain_ && mtl && usd_shader)) { + return; + } + + /* Create the Material's node tree containing the principled BSDF + * and output shaders. */ + + /* Add the node tree. */ + bNodeTree *ntree = ntreeAddTree(nullptr, "Shader Nodetree", "ShaderNodeTree"); + mtl->nodetree = ntree; + mtl->use_nodes = true; + + /* Create the Principled BSDF shader node. */ + bNode *principled = add_node(nullptr, ntree, SH_NODE_BSDF_PRINCIPLED, 0.0f, 300.0f); + + if (!principled) { + std::cerr << "ERROR: Couldn't create SH_NODE_BSDF_PRINCIPLED node for USD shader " + << usd_shader.GetPath() << std::endl; + return; + } + + /* Create the material output node. */ + bNode *output = add_node(nullptr, ntree, SH_NODE_OUTPUT_MATERIAL, 300.0f, 300.0f); + + if (!output) { + std::cerr << "ERROR: Couldn't create SH_NODE_OUTPUT_MATERIAL node for USD shader " + << usd_shader.GetPath() << std::endl; + return; + } + + /* Connect the Principled BSDF node to the output node. */ + link_nodes(ntree, principled, "BSDF", output, "Surface"); + + /* Recursively create the principled shader input networks. */ + set_principled_node_inputs(principled, ntree, usd_shader); + + nodeSetActive(ntree, output); + + ntreeUpdateTree(bmain_, ntree); + + /* Optionally, set the material blend mode. */ + + if (params_.set_material_blend) { + if (needs_blend(usd_shader)) { + float opacity_threshold = get_opacity_threshold(usd_shader, 0.0f); + if (opacity_threshold > 0.0f) { + mtl->blend_method = MA_BM_CLIP; + mtl->alpha_threshold = opacity_threshold; + } + else { + mtl->blend_method = MA_BM_BLEND; + } + } + } +} + +void USDMaterialReader::set_principled_node_inputs(bNode *principled, + bNodeTree *ntree, + const pxr::UsdShadeShader &usd_shader) const +{ + /* The context struct keeps track of the locations for adding + * input nodes. */ + NodePlacementContext context(0.0f, 300.0); + + /* The column index (from right to left relative to the principled + * node) where we're adding the nodes. */ + int column = 0; + + /* Recursively set the principled shader inputs. */ + + if (pxr::UsdShadeInput diffuse_input = usd_shader.GetInput(usdtokens::diffuseColor)) { + set_node_input(diffuse_input, principled, "Base Color", ntree, column, &context); + } + + if (pxr::UsdShadeInput emissive_input = usd_shader.GetInput(usdtokens::emissiveColor)) { + set_node_input(emissive_input, principled, "Emission", ntree, column, &context); + } + + if (pxr::UsdShadeInput specular_input = usd_shader.GetInput(usdtokens::specularColor)) { + set_node_input(specular_input, principled, "Specular", ntree, column, &context); + } + + if (pxr::UsdShadeInput metallic_input = usd_shader.GetInput(usdtokens::metallic)) { + ; + set_node_input(metallic_input, principled, "Metallic", ntree, column, &context); + } + + if (pxr::UsdShadeInput roughness_input = usd_shader.GetInput(usdtokens::roughness)) { + set_node_input(roughness_input, principled, "Roughness", ntree, column, &context); + } + + if (pxr::UsdShadeInput clearcoat_input = usd_shader.GetInput(usdtokens::clearcoat)) { + set_node_input(clearcoat_input, principled, "Clearcoat", ntree, column, &context); + } + + if (pxr::UsdShadeInput clearcoat_roughness_input = usd_shader.GetInput( + usdtokens::clearcoatRoughness)) { + set_node_input( + clearcoat_roughness_input, principled, "Clearcoat Roughness", ntree, column, &context); + } + + if (pxr::UsdShadeInput opacity_input = usd_shader.GetInput(usdtokens::opacity)) { + set_node_input(opacity_input, principled, "Alpha", ntree, column, &context); + } + + if (pxr::UsdShadeInput ior_input = usd_shader.GetInput(usdtokens::ior)) { + set_node_input(ior_input, principled, "IOR", ntree, column, &context); + } + + if (pxr::UsdShadeInput normal_input = usd_shader.GetInput(usdtokens::normal)) { + set_node_input(normal_input, principled, "Normal", ntree, column, &context); + } +} + +/* Convert the given USD shader input to an input on the given Blender node. */ +void USDMaterialReader::set_node_input(const pxr::UsdShadeInput &usd_input, + bNode *dest_node, + const char *dest_socket_name, + bNodeTree *ntree, + const int column, + NodePlacementContext *r_ctx) const +{ + if (!(usd_input && dest_node && r_ctx)) { + return; + } + + if (usd_input.HasConnectedSource()) { + /* The USD shader input has a connected source shader. Follow the connection + * and attempt to convert the connected USD shader to a Blender node. */ + follow_connection(usd_input, dest_node, dest_socket_name, ntree, column, r_ctx); + } + else { + /* Set the destination node socket value from the USD shader input value. */ + + bNodeSocket *sock = nodeFindSocket(dest_node, SOCK_IN, dest_socket_name); + if (!sock) { + std::cerr << "ERROR: couldn't get destination node socket " << dest_socket_name << std::endl; + return; + } + + pxr::VtValue val; + if (!usd_input.Get(&val)) { + std::cerr << "ERROR: couldn't get value for usd shader input " + << usd_input.GetPrim().GetPath() << std::endl; + return; + } + + switch (sock->type) { + case SOCK_FLOAT: + if (val.IsHolding<float>()) { + ((bNodeSocketValueFloat *)sock->default_value)->value = val.UncheckedGet<float>(); + } + else if (val.IsHolding<pxr::GfVec3f>()) { + pxr::GfVec3f v3f = val.UncheckedGet<pxr::GfVec3f>(); + float average = (v3f[0] + v3f[1] + v3f[2]) / 3.0f; + ((bNodeSocketValueFloat *)sock->default_value)->value = average; + } + break; + case SOCK_RGBA: + if (val.IsHolding<pxr::GfVec3f>()) { + pxr::GfVec3f v3f = val.UncheckedGet<pxr::GfVec3f>(); + copy_v3_v3(((bNodeSocketValueRGBA *)sock->default_value)->value, v3f.data()); + } + break; + case SOCK_VECTOR: + if (val.IsHolding<pxr::GfVec3f>()) { + pxr::GfVec3f v3f = val.UncheckedGet<pxr::GfVec3f>(); + copy_v3_v3(((bNodeSocketValueVector *)sock->default_value)->value, v3f.data()); + } + else if (val.IsHolding<pxr::GfVec2f>()) { + pxr::GfVec2f v2f = val.UncheckedGet<pxr::GfVec2f>(); + copy_v2_v2(((bNodeSocketValueVector *)sock->default_value)->value, v2f.data()); + } + break; + default: + std::cerr << "WARNING: unexpected type " << sock->idname << " for destination node socket " + << dest_socket_name << std::endl; + break; + } + } +} + +/* Follow the connected source of the USD input to create corresponding inputs + * for the given Blender node. */ +void USDMaterialReader::follow_connection(const pxr::UsdShadeInput &usd_input, + bNode *dest_node, + const char *dest_socket_name, + bNodeTree *ntree, + int column, + NodePlacementContext *r_ctx) const +{ + if (!(usd_input && dest_node && dest_socket_name && ntree && r_ctx)) { + return; + } + + pxr::UsdShadeConnectableAPI source; + pxr::TfToken source_name; + pxr::UsdShadeAttributeType source_type; + + usd_input.GetConnectedSource(&source, &source_name, &source_type); + + if (!(source && source.GetPrim().IsA<pxr::UsdShadeShader>())) { + return; + } + + pxr::UsdShadeShader source_shader(source.GetPrim()); + + if (!source_shader) { + return; + } + + pxr::TfToken shader_id; + if (!source_shader.GetShaderId(&shader_id)) { + std::cerr << "ERROR: couldn't get shader id for source shader " + << source_shader.GetPrim().GetPath() << std::endl; + return; + } + + /* For now, only convert UsdUVTexture and UsdPrimvarReader_float2 inputs. */ + if (shader_id == usdtokens::UsdUVTexture) { + + if (strcmp(dest_socket_name, "Normal") == 0) { + + /* The normal texture input requires creating a normal map node. */ + float locx = 0.0f; + float locy = 0.0f; + compute_node_loc(column + 1, &locx, &locy, r_ctx); + + bNode *normal_map = add_node(nullptr, ntree, SH_NODE_NORMAL_MAP, locx, locy); + + /* Currently, the Normal Map node has Tangent Space as the default, + * which is what we need, so we don't need to explicitly set it. */ + + /* Connect the Normal Map to the Normal input. */ + link_nodes(ntree, normal_map, "Normal", dest_node, "Normal"); + + /* Now, create the Texture Image node input to the Normal Map "Color" input. */ + convert_usd_uv_texture( + source_shader, source_name, normal_map, "Color", ntree, column + 2, r_ctx); + } + else { + convert_usd_uv_texture( + source_shader, source_name, dest_node, dest_socket_name, ntree, column + 1, r_ctx); + } + } + else if (shader_id == usdtokens::UsdPrimvarReader_float2) { + convert_usd_primvar_reader_float2( + source_shader, source_name, dest_node, dest_socket_name, ntree, column + 1, r_ctx); + } +} + +void USDMaterialReader::convert_usd_uv_texture(const pxr::UsdShadeShader &usd_shader, + const pxr::TfToken &usd_source_name, + bNode *dest_node, + const char *dest_socket_name, + bNodeTree *ntree, + const int column, + NodePlacementContext *r_ctx) const +{ + if (!usd_shader || !dest_node || !ntree || !dest_socket_name || !bmain_ || !r_ctx) { + return; + } + + float locx = 0.0f; + float locy = 0.0f; + compute_node_loc(column, &locx, &locy, r_ctx); + + /* Create the Texture Image node. */ + bNode *tex_image = add_node(nullptr, ntree, SH_NODE_TEX_IMAGE, locx, locy); + + if (!tex_image) { + std::cerr << "ERROR: Couldn't create SH_NODE_TEX_IMAGE for node input " << dest_socket_name + << std::endl; + return; + } + + /* Load the texture image. */ + load_tex_image(usd_shader, tex_image); + + /* Connect to destination node input. */ + + /* Get the source socket name. */ + std::string source_socket_name = usd_source_name == usdtokens::a ? "Alpha" : "Color"; + + link_nodes(ntree, tex_image, source_socket_name.c_str(), dest_node, dest_socket_name); + + /* Connect the texture image node "Vector" input. */ + if (pxr::UsdShadeInput st_input = usd_shader.GetInput(usdtokens::st)) { + set_node_input(st_input, tex_image, "Vector", ntree, column, r_ctx); + } +} + +/* Load the texture image node's texture from the path given by the USD shader's + * file input value. */ +void USDMaterialReader::load_tex_image(const pxr::UsdShadeShader &usd_shader, + bNode *tex_image) const +{ + if (!(usd_shader && tex_image && tex_image->type == SH_NODE_TEX_IMAGE)) { + return; + } + + /* Try to load the texture image. */ + pxr::UsdShadeInput file_input = usd_shader.GetInput(usdtokens::file); + + if (!file_input) { + std::cerr << "WARNING: Couldn't get file input for USD shader " << usd_shader.GetPath() + << std::endl; + return; + } + + pxr::VtValue file_val; + if (!file_input.Get(&file_val) || !file_val.IsHolding<pxr::SdfAssetPath>()) { + std::cerr << "WARNING: Couldn't get file input value for USD shader " << usd_shader.GetPath() + << std::endl; + return; + } + + const pxr::SdfAssetPath &asset_path = file_val.Get<pxr::SdfAssetPath>(); + std::string file_path = asset_path.GetResolvedPath(); + if (file_path.empty()) { + std::cerr << "WARNING: Couldn't resolve image asset '" << asset_path + << "' for Texture Image node." << std::endl; + return; + } + + const char *im_file = file_path.c_str(); + Image *image = BKE_image_load_exists(bmain_, im_file); + if (!image) { + std::cerr << "WARNING: Couldn't open image file '" << im_file << "' for Texture Image node." + << std::endl; + return; + } + + tex_image->id = &image->id; + + /* Set texture color space. + * TODO(makowalski): For now, just checking for RAW color space, + * assuming sRGB otherwise, but more complex logic might be + * required if the color space is "auto". */ + + pxr::TfToken color_space = get_source_color_space(usd_shader); + + if (color_space.IsEmpty()) { + color_space = file_input.GetAttr().GetColorSpace(); + } + + if (color_space == usdtokens::RAW || color_space == usdtokens::raw) { + STRNCPY(image->colorspace_settings.name, "Raw"); + } +} + +/* This function creates a Blender UV Map node, under the simplifying assumption that + * UsdPrimvarReader_float2 shaders output UV coordinates. + * TODO(makowalski): investigate supporting conversion to other Blender node types + * (e.g., Attribute Nodes) if needed. */ +void USDMaterialReader::convert_usd_primvar_reader_float2( + const pxr::UsdShadeShader &usd_shader, + const pxr::TfToken & /* usd_source_name */, + bNode *dest_node, + const char *dest_socket_name, + bNodeTree *ntree, + const int column, + NodePlacementContext *r_ctx) const +{ + if (!usd_shader || !dest_node || !ntree || !dest_socket_name || !bmain_ || !r_ctx) { + return; + } + + float locx = 0.0f; + float locy = 0.0f; + compute_node_loc(column, &locx, &locy, r_ctx); + + /* Create the UV Map node. */ + bNode *uv_map = add_node(nullptr, ntree, SH_NODE_UVMAP, locx, locy); + + if (!uv_map) { + std::cerr << "ERROR: Couldn't create SH_NODE_UVMAP for node input " << dest_socket_name + << std::endl; + return; + } + + /* Set the texmap name. */ + pxr::UsdShadeInput varname_input = usd_shader.GetInput(usdtokens::varname); + if (varname_input) { + pxr::VtValue varname_val; + if (varname_input.Get(&varname_val) && varname_val.IsHolding<pxr::TfToken>()) { + std::string varname = varname_val.Get<pxr::TfToken>().GetString(); + if (!varname.empty()) { + NodeShaderUVMap *storage = (NodeShaderUVMap *)uv_map->storage; + BLI_strncpy(storage->uv_map, varname.c_str(), sizeof(storage->uv_map)); + } + } + } + + /* Connect to destination node input. */ + link_nodes(ntree, uv_map, "UV", dest_node, dest_socket_name); +} + +} // namespace blender::io::usd |