前のページで説明したように、mia_material の反射動作を正確にエミュレートすることができます。実際問題として、ほぼすべての側面をシミュレートすることができ、ほとんどの設定の mia_material の動作を模倣するようにフェノメナを作成することができます。
これが可能になった理由は、mia_material に機能をオンまたはオフする複数のスイッチが用意されていることです。通常これは、異なるレイヤ設定を使ってシミュレートする必要があります。たとえば、mia_material は thin_walled モードがオンかオフかで本質的に異なる動作をします。レイヤ化シェーダに関して、この thin_walled オプションは mila_material に対して作用します。また、カットアウト機能は、可視性として実装されていますが、特定のレイヤが透明をコンポーネントとして持っている場合があります。
次に、mia_material にそっくりの動作をする mia_material_emulator という名前のフェノメナを一覧します。
これは、mia_material のようなものを作ろうと思えば作れるということの例に過ぎません。レイヤ シェーダを直接使用する方が最適なことが多いですが、既存の mia_materials をミックスすることが望ましい場合があり、そのような場合に役立ちます。
declare phenomenon
color "mila_layer_mia_material" (
scalar "diffuse_weight" default 1.0, #: min 0.0 max 1.0
color "diffuse" default 0.5 0.5 0.5,
scalar "diffuse_roughness" default 0.0, #: min 0.0 max 1.0
scalar "reflectivity" default 0.6, #: min 0.0 max 1.0
color "refl_color" default 1.0 1.0 1.0,
scalar "refl_gloss" default 1.0, #: min 0.0 max 1.0
scalar "refl_gloss_quality" default 1.0, #: min 0.0 softmax 4.0
scalar "transparency" default 0.0, #: min 0.0 max 1.0
color "refr_color" default 1.0 1.0 1.0,
scalar "refr_gloss" default 1.0, #: min 0.0 max 1.0
scalar "refr_ior" default 1.4, #: min 0.1 softmax 2.0
scalar "refr_gloss_quality" default 1.0, #: min 0.0 softmax 4.0
boolean "refr_translucency" default off,
color "refr_trans_color" default 0.7 0.6 0.5,
scalar "refr_trans_weight" default 0.5, #: min 0.0 max 1.0
scalar "anisotropy" default 1.0, #: min 0.1 softmax 10
scalar "anisotropy_rotation" default 0.0, #: softmin 0 softmax 1
integer "anisotropy_channel" default -1, #: min -1 softmax 64
integer "brdf_fresnel_mode" default 1, #Custom curve (aka manual), while 0 Fresnel uses refr_ior
scalar "brdf_0_degree_refl" default 0.2, #: min 0.0 max 1.0
scalar "brdf_90_degree_refl" default 1.0, #: min 0.0 max 1.0
scalar "brdf_curve" default 5.0, #: min 0.1 softmax 20
# Reflection/Refraction optimizations & falloffs
boolean "refl_falloff_on" default off,
scalar "refl_falloff_dist" default 0.0,
boolean "refl_falloff_color_on" default off,
color "refl_falloff_color" default 0 0 0,
boolean "refr_falloff_on" default off,
scalar "refr_falloff_dist" default 0.0,
boolean "refr_falloff_color_on" default off,
color "refr_falloff_color" default 0 0 0,
# Factors
scalar "indirect" default 1.0, #: min 0 softmax 1.0
# Built in AO
scalar "quality" default 1.0, #: min 0.0 softmax 2.0
# Only one bump input
vector "overall_bump"
)
shader "refl_roughness" "mila_get_roughness" ("glossiness" = interface "refl_gloss")
# Reflections
shader "reflection" "mila_glossy_reflection" (
"roughness" = "refl_roughness",
"quality" = interface "refl_gloss_quality",
"anisotropy" = interface "anisotropy",
"aniso_angle" = interface "anisotropy_rotation",
"aniso_channel" = interface "anisotropy_channel",
"use_max_dist" = interface "refl_falloff_on",
"max_dist" = interface "refl_falloff_dist",
"use_max_dist_color" = interface "refl_falloff_color_on",
"max_dist_color" = interface "refl_falloff_color",
)
shader "refr_roughness" "mila_get_roughness" ("glossiness" = interface "refr_gloss")
# Refractions
shader "refraction" "mila_glossy_transmission" (
"roughness" = "refr_roughness",
"quality" = interface "refr_gloss_quality",
"ior" = interface "refr_ior",
"anisotropy" = interface "anisotropy",
"aniso_angle" = interface "anisotropy_rotation",
"aniso_channel" = interface "anisotropy_channel",
"use_max_dist" = interface "refr_falloff_on",
"max_dist" = interface "refr_falloff_dist",
"use_max_dist_color" = interface "refr_falloff_color_on",
"max_dist_color" = interface "refr_falloff_color"
)
# Translucency
shader "translucency" "mila_diffuse_transmission" (
"tint" = interface "refr_trans_color",
"indirect" = interface "indirect_multiplier"
)
# Diffuse
shader "diffuse" "mila_diffuse_reflection" (
"roughness" = interface "diffuse_roughness",
"indirect" = interface "indirect_multiplier",
"quality" = interface "quality"
)
# Transparency and Translucency live in a
# separate "sub layers" because they steal
# energy from eachother
shader "transmission" "mila_layer" (
"layers" [
{
"shader" "translucency",
"weight_tint" 1 1 1,
"weight" = interface "refr_trans_weight",
"use_directional_weight" off,
"on" = interface "refr_translucency"
},
{
"shader" "refraction",
"weight_tint" 1 1 1,
"weight" 1,
"use_directional_weight" off,
"on" on
}
]
)
#
# The main layers, mimicking mia_materials
# energy conservation logic
#
shader "mia_layers" "mila_layer" (
"layers" [
{
"shader" "reflection", # Reflection layer
"weight_tint" = interface "refl_color",
"bump" = interface "overall_bump",
"weight" = interface "reflectivity",
"use_directional_weight" on,
"directional_weight_mode" = interface "brdf_fresnel_mode",
"normal_reflectivity" = interface "brdf_0_degree_refl",
"grazing_reflectivity" = interface "brdf_90_degree_refl",
"exponent" = interface "brdf_curve",
"ior" = interface "refr_ior",
"on" on
},
{
"shader" "transmission", # Transparency+Translucency
"bump" = interface "overall_bump",
"weight_tint" = interface "refr_color",
"weight" = interface "transparency",
"use_directional_weight" off,
"on" on
},
{
"shader" "diffuse", # Diffuse
"bump" = interface "overall_bump",
"weight_tint" = interface "diffuse",
"weight" = interface "diffuse_weight",
"use_directional_weight" off,
"on" on
}
]
)
root = "mia_layers"
apply material, texture, shadow, photon
version 1
end declare
mia_material_emulator は mia_material(_x) と同じパラメータを持ちますが、次の違いがあります。これらの違いのいくつかは、ユーザ インタフェースやシンプルなマッピング シェーダによって隠すことができます。
mia_material の以下のパラメータは存在しないか、異なっています。
カー ペイント シェーダのエミュレーションは実際はもっと困難です。これはカー ペイント シェーダが、古くて、物理特性の再現性が非常に低いためです。このエミュレーションは視覚的に正確なものではありません。むしろよりリアルな外観になり、物理的に正確なものになります。古いカー ペイント フェノメナには、次の問題があります。
これは、「実用性の高い」カー ペイント パラメータを複製し、物理的により正確な新しいフェノメナを作成する場合に、大きな意味を持ちます。これによって、古いシェーダの機能の一部は維持されますが、よりリアルになります。ここでは、このようなフェノメナに対する 1 つの試みを紹介します。他のバージョンが存在している可能性もあります。
declare phenomenon
color "mila_layer_car_paint"
(
color "base_color" default 0.8 0.1 0,
color "edge_color" default 0 0 0,
scalar "edge_color_bias" default 1.0,
color "lit_color" default 0.6 0 0.2,
scalar "diffuse_weight" default 1.0,
color "flake_color" default 1 1 1,
scalar "flake_weight" default 1.0,
scalar "flake_density" default 0.8,
scalar "flake_strength" default 0.8,
scalar "flake_scale" default 0.1,
integer "flake_type" default 0,
integer "flake_cell_style" default 0,
scalar "flake_cell_size" default 0.3,
# New - more physical - parameters
scalar "flake_roughness" default 0.4,
scalar "glossy_paint_weight" default 0.1,
scalar "glossy_paint_roughness" default 0.6,
color "clearcoat_1_color" default 1 1 1,
scalar "clearcoat_1_weight" default 1.0,
scalar "clearcoat_1_roughness" default 0.0,
color "clearcoat_2_color" default 1 1 1,
scalar "clearcoat_2_weight" default 0.0,
scalar "clearcoat_2_roughness" default 0.4,
scalar "clearcoat_ior" default 1.8,
scalar "quality" default 1.0,
scalar "max_distance" default 0.0,
# Dirt
color "dirt_color" default .3 .3 .3,
scalar "dirt_weight" default 0.0,
scalar "irradiance_weight" default 1.0,
)
shader "flakes" "mila_bump_flakes" (
"weight" = interface "flake_weight",
"scale" = interface "flake_scale",
"perturbation" = interface "flake_strength",
"density" = interface "flake_density",
"type" = interface "flake_type",
"circle_size" = interface "flake_cell_size",
"cell_style" = interface "flake_cell_style",
)
shader "dirt" "mila_diffuse_reflection" (
"tint" = interface "dirt_color",
"indirect" = interface "irradiance_weight"
)
shader "clearcoat_2" "mila_glossy_reflection" (
"roughness" = interface "clearcoat_2_roughness",
"quality" = interface "quality"
)
shader "clearcoat_1" "mila_glossy_reflection" (
"roughness" = interface "clearcoat_1_roughness",
"quality" = interface "quality"
)
shader "flakes_gloss" "mila_glossy_reflection" (
"tint" = interface "flake_color",
"roughness" = interface "flake_roughness",
"quality" = interface "quality"
)
shader "glossy_paint" "mila_glossy_reflection" (
"roughness" = interface "glossy_paint_roughness",
"quality" = interface "quality"
)
shader "edge_diffuse" "mila_diffuse_reflection" (
"tint" = interface "edge_color",
"indirect" = interface "irradiance_weight"
)
shader "main_diffuse" "mila_diffuse_reflection" (
"tint" = interface "base_color",
"indirect" = interface "irradiance_weight"
)
shader "mia_layers" "mila_layer" (
"layers" [
{
"shader" "dirt",
"weight" = interface "dirt_weight",
"weight_tint" 1 1 1,
"on" on
},
{
"shader" "clearcoat_1",
"weight" = interface "clearcoat_1_weight",
"weight_tint" = interface "clearcoat_1_color",
"use_directional_weight" on,
"directional_weight_mode" 0,
"ior" = interface "clearcoat_ior",
"on" on
},
{
"shader" "clearcoat_2",
"weight" = interface "clearcoat_2_weight",
"weight_tint" = interface "clearcoat_2_color",
"use_directional_weight" on,
"directional_weight_mode" 0,
"ior" = interface "clearcoat_ior",
"on" on
},
{
"shader" "flakes_gloss",
"weight" = "flakes.visibility",
"weight_tint" 1 1 1,
"bump" = "flakes.normal",
"on" on
},
{
"shader" "glossy_paint",
"weight" = interface "glossy_paint_weight",
"weight_tint" = interface "lit_color",
"on" on
},
{
"shader" "edge_diffuse",
"weight" = interface "diffuse_weight",
"weight_tint" 1 1 1,
"use_directional_weight" on,
"directional_weight_mode" 1,
"normal_reflectivity" 0.0,
"grazing_reflectivity" 1.0,
"exponent" = interface "edge_color_bias",
"on" on
},
{
"shader" "main_diffuse",
"weight_tint" 1 1 1,
"weight" = interface "diffuse_weight",
"on" on
}
]
)
root = "mia_layers"
apply material, texture, shadow, photon
version 2
end declare
このフェノメナは、次の 7 つのレイヤ(上から下)で作成されています。
