Mesh Transparent

Features#

The Mesh Transparent abstract material has features implemented as internal states that can be enabled on demand in the child material:

State Name	Default	Conditions	Description
transparent_blur	false	(none)	Enables rendering of transparent blur effect.
refraction	false	(none)	Enables rendering of post-processing refraction.
refraction_information_lost_fix	false	refraction	Enables correction of refraction for “information lost” areas using information from areas beyond the object's internal volume.
refraction_front_side	false	refraction && refraction_information_lost_fix	Renders refraction only for front faces. This option can be used for glass objects with no cavities inside. When enabled, the surface shall overlap all transparent objects located behind it.
planar_reflection	false	(none)	Enables rendering of dynamic reflections. Using this option you can create realistic flat mirrors and flat reflective surfaces (parquet, flat varnished surfaces, etc.)
reflection_size	7	planar_reflection	Reflection map size, in pixels. Possible values: [128, 256, 512, 1024, 2048, 4096, quart_height, half_height, height]
reflection_two_sided	false	(none)	Use Two Sided option for reflections
reflection_show_pivot	false	(none)	Enable two-sided planar reflection mode.
reflection_blur	true	(none)	Show the reflection pivot point.
ambient_light	true	(none)	Enables the support for two and more World Lights.
ambient	true	(none)	Enable rendering of the material illuminated by an environment probe light source.
environment_probe	true	ambient	Enable rendering of the material illuminated by an environment probe light source.
voxel_probe	true	ambient	Enable rendering of the material illuminated by a voxel probe light source.
planar_probe	true	ambient	Enable rendering of the material illuminated by a planar probe light source.
light_omni	true	(none)	Enable rendering of the material illuminated by an omni light source.
light_proj	true	(none)	Enable rendering of the material illuminated by a projected light source.
light_world	true	(none)	Enable rendering of the material illuminated by a world light source.
multiple_environment_probes	false	environment_probe	Illuminate a transparent object with several environment probes and map their cubemaps to this object.
lerp_cascades	false	(none)	Lerp Cascades
shadow_filter_mode	2	(none)	Filter Mode. Possible values: [none, low, medium, high ultra]
shadow_penumbra_mode	0	(none)	Penumbra Mode. Possible values: [none, low, medium, high ultra]
shadow_filter_noise	true	(none)	Filter Noise
shadow_penumbra_noise	true	(none)	Penumbra Noise

Shaders#

fragment#

For every type of light the right PASS is called based on which one can choose the right shading logic:

transparent_blur
refraction
ambient
light_omni
light_proj
light_world
light_environment_probe
light_voxel_probe
light_planar_probe

Fragment shader has the following output values:

Output Data#

Name	Type	Description
OUT_FRAG_TRANSPARENT_REFRACTION	float2	UV offset for transparent refraction (requires enabled transparent_blur and refraction)
OUT_FRAG_TRANSPARENT_BLUR	float	transparent blur radius

Textures#

Here’s the list of available textures that are pre-defined and used in fragment shader:

Texture name	Texture type	State	Pass	Description
TEX_REFLECTION_CUBE	Cube	ambient	ambient	Reflection cubemap
TEX_REFLECTION_2D	2D	ambient && planar_reflection	ambient	Reflection texture
TEX_TRANSPARENT_ENVIRONMENT_PROBE	2D	ambient && multiple_environment_probes	ambient	Environment probes rendered on transparent objects
TEX_SKY_LUT	2D Array	ambient && ambient_light	ambient	An array of sky lookup tables
TEX_REFLECT	2D	ambient	light_planar_probe	Planar reflection texture
TEX_REFLECT	Cube	ambient	light_environment_probe	Cube reflection texture
TEX_LIGHTMAP	2D	lightmap	ambient, deferred	Baked lightmap texture

Usage Example#

ULON

BaseMaterial <parent=Unigine::mesh_transparent>
{
    Texture2D albedo = "core/textures/common/checker_d.dds"
    Color albedo = [1 1 1 0.5]
    
    // optimization
    State static_shadow = true
    State vertex_velocity = false
    
    Shader vertex_struct =
    #{
        INIT_BASE_DATA
    #}
    
    Shader common =
    #{
        float4 sample_color(float2 uv)
        {
            return TEXTURE(tex_albedo, uv) * var_albedo;
        }
    #}
    
    Shader fragment =
    #{
        float4 color = sample_color(DATA_UV.xy);
        
        OUT_FRAG_ALBEDO = color.rgb;
        OUT_FRAG_SPECULAR = 0.5f;
        OUT_FRAG_ROUGHNESS = 1.0f;
        OUT_FRAG_METALNESS = 0.0f;
        
        OUT_FRAG_OPACITY = color.a;
    #}
}

Last update: 23.06.2023

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Mesh Transparent

In This Article:

Features#

Shaders#

fragment#

Output Data#

Textures#

Usage Example#