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Planar projection :
- orithonornal_basis - project_to_plane - planar_projection
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‎libraries/stdlib/stdlib_defs.mtlx‎

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<output name="out" type="vector3" doc="Offset surface normal; connect this to a shader's 'normal' input." />
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</nodedef>
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<!--
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Node: <orthonormal_basis>
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Compute orthonormal basis
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-->
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<nodedef name="ND_orthonormal_basis_1_0_vector3_vector3" node="orthonormal_basis" version="1.0" isdefaultversion="true" nodegroup="geometric" uiname="Orthonormal Basis" doc="Compute perpendicular basis vectors from a primary direction and normal">
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<input name="primary_dir" type="vector3" value="1,0,0" uiname="Primary Direction" doc="Primary direction. Maps to U axis output" />
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<input name="normal_dir" type="vector3" value="0,0,1" uiname="Normal Direction" doc="Normal direction." />
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<output name="out_u_axis" type="vector3" uiname="U Axis"/>
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<output name="out_v_axis" type="vector3" uiname="V Axis"/>
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</nodedef>
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<!--
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Node: <project_to_plane>
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Projection point to to infinite plane
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-->
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<nodedef name="ND_project_to_plane_1_0_vector3" node="project_to_plane" version="1.0" isdefaultversion="true" nodegroup="geometric" uiname="Project to Plane" doc="Project 3D point onto an infinite 3D plane">
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<input name="point" type="vector3" value="0,0,0" uiname="Input Position" doc="Point to project" />
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<input name="plane_origin" type="vector3" value="0,0,0" uiname="Plane Origin" doc="Position of the origin of the plane" />
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<input name="plane_normal" type="vector3" value="0,0,1" uiname="Plane Normal" doc="Normal of the plane" />
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<output name="out" type="vector3" uiname="Projected Position"/>
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</nodedef>
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<!--
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Node: <planar_projection>
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Planar projection of a 3d point to a plane to produce texture coordinates
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-->
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<nodedef name="ND_planar_projection_1_0_vector2" node="planar_projection" version="1.0" isdefaultversion="true" nodegroup="geometric" uiname="Planar UV Projection" doc="Compute texture coordinates of a projection of a 3d point to a plane">
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<input name="point" type="vector3" value="0,0,0" uiname="Input Position" doc="Input position" />
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<input name="plane_origin" type="vector3" value="0,0,0" uiname="Plane Origin" doc="Position of origin of the plane" />
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<input name="plane_normal" type="vector3" value="0,0,1" uiname="Plane Normal" doc="Normal of the plane" />
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<input name="u_vector" type="vector3" value="1,0,0" uiname="U Direction" doc="Specify the direction of U" />
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<output name="out" type="vector2" uiname="UV Coordinates" />
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</nodedef>
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<!-- ======================================================================== -->
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<!-- Application nodes -->
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<!-- ======================================================================== -->

‎libraries/stdlib/stdlib_ng.mtlx‎

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<output name="out" type="vector3" nodename="N_normalmap" />
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</nodegraph>
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<!--
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Node: <orthonormal_basis>
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-->
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<nodegraph name="NG_orthonormal_basis_1_0_vector3_vector3" nodedef="ND_orthonormal_basis_1_0_vector3_vector3" doc="Compute perpendicular basis vectors from a primary direction and normal">
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<normalize name="norm_primary" type="vector3">
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<input name="in" type="vector3" interfacename="primary_dir" />
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</normalize>
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<normalize name="norm_normal" type="vector3">
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<input name="in" type="vector3" interfacename="normal_dir" />
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</normalize>
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<dotproduct name="dot_primary_normal" type="float">
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<input name="in1" type="vector3" nodename="norm_primary" />
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<input name="in2" type="vector3" nodename="norm_normal" />
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</dotproduct>
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<multiply name="parallel_component" type="vector3">
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<input name="in1" type="vector3" nodename="norm_normal" />
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<input name="in2" type="float" nodename="dot_primary_normal" />
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</multiply>
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<subtract name="ortho_u" type="vector3">
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<input name="in1" type="vector3" nodename="norm_primary" />
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<input name="in2" type="vector3" nodename="parallel_component" />
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</subtract>
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<normalize name="final_u" type="vector3">
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<input name="in" type="vector3" nodename="ortho_u" />
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</normalize>
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<crossproduct name="final_v" type="vector3">
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<input name="in1" type="vector3" nodename="norm_normal" />
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<input name="in2" type="vector3" nodename="final_u" />
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</crossproduct>
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<output name="out_u_axis" type="vector3" nodename="final_u" />
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<output name="out_v_axis" type="vector3" nodename="final_v" />
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</nodegraph>
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<!--
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Node: <project_to_plane>
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-->
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<nodegraph name="NG_project_to_plane_1_0_vector3" nodedef="ND_project_to_plane_1_0_vector3" doc="Project 3D point onto an infinite 3D plane">
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<subtract name="relative_pos" type="vector3">
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<input name="in1" type="vector3" interfacename="point" />
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<input name="in2" type="vector3" interfacename="plane_origin" />
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</subtract>
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<dotproduct name="signed_dist" type="float">
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<input name="in1" type="vector3" nodename="relative_pos" />
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<input name="in2" type="vector3" interfacename="plane_normal" />
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</dotproduct>
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<multiply name="offset_vec" type="vector3">
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<input name="in1" type="vector3" interfacename="plane_normal" />
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<input name="in2" type="float" nodename="signed_dist" />
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</multiply>
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<subtract name="projected_pos" type="vector3">
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<input name="in1" type="vector3" nodename="relative_pos" />
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<input name="in2" type="vector3" nodename="offset_vec" />
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</subtract>
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<output name="out" type="vector3" nodename="projected_pos" />
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</nodegraph>
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<!--
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Node: <planar_projection>
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-->
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<nodegraph name="NG_planar_projection_1_0_vector2" nodedef="ND_planar_projection_1_0_vector2" doc="Compute texture coordinates of a projection of a 3d point to a plane">
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<!-- Project position to plane -->
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<project_to_plane name="point_proj" type="vector3">
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<input name="point" type="vector3" interfacename="point" />
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<input name="plane_origin" type="vector3" interfacename="plane_origin" />
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<input name="plane_normal" type="vector3" interfacename="plane_normal" />
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</project_to_plane>
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<!-- Generate orthonormal basis -->
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<orthonormal_basis name="basis_gen" type="multioutput">
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<input name="primary_dir" type="vector3" interfacename="u_vector" />
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<input name="normal_dir" type="vector3" interfacename="plane_normal" />
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<output name="out_u_axis" type="vector3" />
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<output name="out_v_axis" type="vector3" />
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</orthonormal_basis>
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<!-- Calculate UV coordinates -->
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<dotproduct name="u_coord" type="float">
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<input name="in1" type="vector3" nodename="point_proj" />
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<input name="in2" type="vector3" nodename="basis_gen" output="out_u_axis" />
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</dotproduct>
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<dotproduct name="v_coord" type="float">
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<input name="in1" type="vector3" nodename="point_proj" />
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<input name="in2" type="vector3" nodename="basis_gen" output="out_v_axis" />
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</dotproduct>
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<combine2 name="combined_uv" type="vector2">
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<input name="in1" type="float" nodename="u_coord" />
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<input name="in2" type="float" nodename="v_coord" />
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</combine2>
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<output name="out" type="vector2" nodename="combined_uv" />
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</nodegraph>
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<!-- ======================================================================== -->
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<!-- Global nodes -->
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<!-- ======================================================================== -->

‎resources/Images/alpha_test.png‎

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‎resources/Materials/TestSuite/stdlib/texture/planar_projection.mtlx‎

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<?xml version="1.0"?>
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<materialx version="1.39" colorspace="lin_rec709">
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<position name="position_object" type="vector3">
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<input name="space" type="string" value="object" />
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</position>
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<position name="position_world" type="vector3">
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<input name="space" type="string" value="world" />
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</position>
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<planar_projection name="planar_projection_world" type="vector2">
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<input name="point" type="vector3" nodename="position_world" />
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<input name="plane_origin" type="vector3" value="0, 0, 0" />
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<input name="plane_normal" type="vector3" value="0, 0, 1" />
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<input name="u_vector" type="vector3" value="1, 0, 0" />
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</planar_projection>
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<surfacematerial name="project_material" type="material">
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<input name="surfaceshader" type="surfaceshader" nodename="project_shader" />
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</surfacematerial>
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<surface_unlit name="project_shader" type="surfaceshader">
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<input name="emission" type="float" value="1" />
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<input name="emission_color" type="color3" nodename="convert_color4" />
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<input name="transmission" type="float" value="0" />
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<input name="transmission_color" type="color3" value="1, 1, 1" />
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<input name="opacity" type="float" value="1" />
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</surface_unlit>
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<surfacematerial name="project_blend_material" type="material">
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<input name="surfaceshader" type="surfaceshader" nodename="project_shader_blend" />
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</surfacematerial>
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<surface_unlit name="project_shader_blend" type="surfaceshader">
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<input name="emission" type="float" value="1" />
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<input name="emission_color" type="color3" nodename="convert_color5" />
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<input name="transmission" type="float" value="0" />
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<input name="transmission_color" type="color3" value="1, 1, 1" />
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<input name="opacity" type="float" value="1" />
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</surface_unlit>
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<convert name="convert_color5" type="color3">
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<input name="in" type="color4" nodename="blend_images" />
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</convert>
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<image name="image_project_object" type="color4">
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<input name="file" type="filename" value="D:\Work\materialx\MaterialXLab\prototyping\image_diff\placeholder.png" colorspace="srgb_texture" fileprefix="" />
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<input name="layer" type="string" value="" />
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<input name="default" type="color4" value="0, 0, 0, 0" />
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<input name="texcoord" type="vector2" nodename="planar_projection_object" />
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<input name="uaddressmode" type="string" value="periodic" />
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<input name="vaddressmode" type="string" value="periodic" />
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</image>
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<planar_projection name="planar_projection_object" type="vector2">
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<input name="point" type="vector3" nodename="position_object" />
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<input name="plane_origin" type="vector3" value="0, 0, 0" />
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<input name="plane_normal" type="vector3" value="0, 1, 0" />
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<input name="u_vector" type="vector3" value="1, 0, 0" />
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</planar_projection>
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<image name="image_project_world" type="color4">
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<input name="file" type="filename" value="D:\Work\materialx\bernard_MaterialX\resources\Images\alpha_test.png" colorspace="srgb_texture" fileprefix="" />
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<input name="layer" type="string" value="" />
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<input name="default" type="color4" value="0, 0, 0, 0" />
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<input name="texcoord" type="vector2" nodename="planar_projection_world" />
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<input name="uaddressmode" type="string" value="periodic" />
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<input name="vaddressmode" type="string" value="periodic" />
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</image>
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<convert name="convert_color4" type="color3">
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<input name="in" type="color4" nodename="image_project_world" />
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</convert>
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<mix name="blend_images" type="color4">
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<input name="fg" type="color4" nodename="image_project_world" />
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<input name="bg" type="color4" nodename="image_project_object" />
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<input name="mix" type="color4" value="0.5, 0.5, 0.5, 0.5" />
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</mix>
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</materialx>

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