Mesh

Features#

The abstract material for a mesh has features implemented as internal states that can be enabled on demand in the child material:

Name	Description
Engine	Essential features of the Mesh material.
Post Processing	Post Processing effects that are supported by the material.
Specular AA	Specular Anti-Aliasing feature.
Tessellation	Mesh Tessellation feature.

Notice

The following states, options and parameters are the base functionality that is also available in the Mesh Transparent and Mesh Unlit abstract materials.

Engine#

Engine group.

alpha_fade ( State )
Description:	Adds smooth transitions in the areas neighboring with visibility limits of the mesh (defined by fade and visibility settings for a surface to which the material is assigned). Can be used for smooth transitions between LODs.
Internal:	true
Default:	false
gbuffer ( State )
Description:	Enables writing of deferred buffers for the material.
Editable:	false
Default:	true
lightmap ( State )
Description:	Enables lightmaps for the geometry to which this material is assigned.
Internal:	true
Default:	false
wireframe_antialiasing ( State )
Description:	Enables antialiasing of wireframes for the geometry to which this material is assigned.
Internal:	true
Default:	false
force_velocity ( State )
Description:	Enabling this option forces the Engine to calculate velocity required for the mesh to support TAA.
Editable:	false
Default:	false
dynamic ( State )
Description:	Enables writing to velocity buffer.
Internal:	true
Default:	false
Condition:	(!force_velocity)
static_shadow ( State )
Description:	Enables using the Unigine::mesh_static_shadow material instead of this material for shadows. Disabled for forward materials that support ObjectMeshStatic or ObjectParticles.
Editable:	false
Default:	false
Condition:	(!tessellation_shadow && !custom_depth)
custom_depth ( State )
Description:	Enables writing custom depth to the Z-Buffer.
Editable:	false
Default:	0
custom_depth_shadow ( State )
Description:	Flag indicating whether custom depth affects shadows.
Editable:	false
Default:	true
Condition:	(custom_depth)
tessellation ( State )
Description:	Enables tessellation for the geometry to which this material is assigned.
Editable:	false
Default:	false
emission ( State )
Description:	Enables emission rendering. This effect simulates glow from extremely bright surfaces and can be used to create self-luminous objects (lamps, fire, etc.)
Editable:	false
Default:	false
auxiliary ( State )
Description:	Enables auxiliary rendering pass for the material. Can be used for custom post-effects, such as thermal vision, etc.
Editable:	false
Default:	false
blend_src ( Option )
Description:	Option used to scale the source color (the color of an overlaying material).
Editable:	false
Default:	src_alpha
blend_dest ( Option )
Description:	Option used to scale the destination color (the color of an obscured material).
Editable:	false
Default:	one_minus_src_alpha
transparent ( Option )
Description:	Transparency type of the material.
Editable:	false
Default:	none
overlap ( Option )
Description:	Render polygons, to which the material is applied, on the top of the render. This can be used for UI elements.
Editable:	false
Default:	false
two_sided ( Option )
Description:	Render polygons, to which the material is applied, two times per lighting pass. This option should be disabled to gain performance, when you don't need both sides of polygons to be rendered.
Editable:	false
Default:	false
depth_test ( Option )
Description:	Toggles depth testing for the material on and off. This can be used to make objects occluded by others visible (e.g. a character behind a wall).
Editable:	false
Default:	true
depth_mask ( Option )
Description:	A flag indicating if writing in the depth buffer is enabled for a material (only for Object).
Editable:	false
Default:	true

Post Processing#

The following states define bits in the material mask:

material_ssao ( State )
Description:	Enables the screen-space ambient occlusion (SSAO) for this material (Alpha Test and Opaque only, non Alpha Blend materials).
Default:	true
Condition:	(gbuffer)&&(transparent!=2)
material_ssr ( State )
Description:	Enables the screen-space reflections (SSR) for this material (Alpha Test and Opaque only, non Alpha Blend materials).
Default:	true
Condition:	(gbuffer)&&(transparent!=2)
material_sssss ( State )
Description:	Enables the Screen-Space Subsurface Scattering (SSSSS) for this material (Alpha Test and Opaque only, non Alpha Blend materials).
Default:	false
Condition:	(gbuffer)&&(transparent!=2)
material_dof ( State )
Description:	Enables the Depth of Field (DOF) effect for this material.
Default:	true
Condition:	(gbuffer)
material_motion_blur ( State )
Description:	Enables the motion blur for this material.
Default:	true
Condition:	(gbuffer)
material_screen_space_shadows ( State )
Description:	Enables the screen space shadows for this material.
Default:	true
Condition:	(gbuffer)
material_shoreline_wetness ( State )
Description:	Enables the wetness effect for objects near the shoreline for this material (Alpha Test and Opaque only, non Alpha Blend materials).
Default:	true
Condition:	(gbuffer)&&(transparent!=2)

Specular AA#

specular_aa ( State )
Description:	Anti-aliasing of specular highlights. This anti-aliasing is performed by increasing roughness at places where normals change their orientation. Geometry of the model is used, the normal map is not required.
Editable:	true
Internal:	false
Default:	false
specular_aa_intensity ( Slider )
Description:	Strength of the specular anti-aliasing effect between 0 and 1. Higher values produce a blurrier result with less aliasing.
Editable:	true
Internal:	false
specular_aa_threshold ( Slider )
Description:	Maximum value for the offset to be subtracted from the smoothness value to reduce artifacts.
specular_aa_albedo_impact ( State )
Description:	Intensity of darkening the albedo on metal surfaces.
specular_aa_specular_impact ( Slider )
Description:	Intensity of darkening the specular on dielectric surfaces.
specular_aa_roughness_impact ( State )
Description:	Intensity of roughness.

Tessellation#

tessellation_shadow ( State )
Description:	Enables tessellation for the shadow pass.
Default:	false
Condition:	(tessellation)

tessellation_density ( Slider )
Description:	Coefficient for subpixel reduction of polygons. The value of 1 corresponds to the highest mesh density defined by the Factor parameter. Notice: although lower values help significantly reduce the number of polygons and improve the performance, be careful as visual artifacts may appear when the camera moves. To get rid of wiggling and keep the small number of polygons, it is recommended to increase Density while decreasing Factor values.
Default:	0.5
Condition:	(tessellation)
tessellation_shadow_factor ( Slider )
Description:	Coefficient of tessellation intensity for shadow polygons: higher values produce more polygons.
Default:	0.25
Condition:	(tessellation)&&(tessellation_shadow)
tessellation_shadow_density ( Slider )
Description:	Coefficient for subpixel reduction of shadow polygons. The value of 1 corresponds to the highest mesh density defined by the Shadow Factor parameter.
Default:	0.1
Condition:	(tessellation)&&(tessellation_shadow)
tessellation_distance_falloff_near ( Slider )
Description:	Distance (in units) from the camera where tessellation falloff starts.
Default:	2
Condition:	(tessellation)
tessellation_distance_falloff_far ( Slider )
Description:	Tessellation falloff distance range, in units. Tessellation effect is rendered at the distance range from Near to Near + Far.
Default:	50
Condition:	(tessellation)
tessellation_distance_falloff_exp ( Slider )
Description:	Determines how fast the tessellation intensity decreases with the distance.
Default:	1
Condition:	(tessellation)
tessellation_distance_falloff_max_mip ( Slider )
Description:	Maximum allowed mipmap level of the Displacement texture to avoid losing tessellation details with the distance.
Default:	6
Condition:	(tessellation)
tessellation_culling_near ( Slider )
Description:	Distance (in units) from the camera where the tessellation culling starts.
Default:	1
Condition:	(tessellation)
tessellation_culling_back_face ( Slider )
Description:	Angle (in degrees) between the camera and a polygon of the control mesh, at which the polygon is not tessellated.
Default:	0.5
Condition:	(tessellation)
tessellation_culling_screen_border ( Slider )
Description:	Screen border offset used to prevent undesired culling of tessellated polygons outside the screen.
Default:	0.1
Condition:	(tessellation)
tessellation_shadow_culling_back_face ( Slider )
Description:	Angle (in degrees) between the camera and a shadow polygon of the control mesh, at which this polygon is not tessellated.
Default:	0.8
Condition:	(tessellation)&&(tessellation_shadow)
tessellation_shadow_culling_screen_border ( Slider )
Description:	Screen border offset used to prevent undesired culling of tessellated shadow polygons outside the screen.
Default:	0.05
Condition:	(tessellation)&&(tessellation_shadow)

Shaders#

Here's the list of available shader code that includes types for the current abstract material. These custom shaders are included in the abstract material's shader in the corresponding place via marker.

common#

All shader code that you describe here (variables, functions, defines, constants, etc.) is included in every other type of shader: vertex, control, evaluate, fragment.

vertex_struct#

Using the following structures you can get access to the base and user data in these shaders: vertex, control, evaluate, fragment.

Name	Arguments	Description
INIT_BASE_DATA	(none)	Initializes the base structure variables (available in all shaders).
INIT_USER_DATA	TYPE — type of the user data NAME — name of the user data	Initializes user data that will be interpolated between vertices and passed through the shader pipeline.
INIT_USER_NOINTERPOLATION_DATA	TYPE — type of the user data NAME — name of the user data	Initializes user data that won’t be interpolated between vertices but still will be passed through shader pipeline.

Name

Arguments

Description

INIT_BASE_DATA

(none)

Initializes the base structure variables (available in all shaders).

INIT_USER_DATA

TYPE — type of the user data

NAME — name of the user data

Initializes user data that will be interpolated between vertices and passed through the shader pipeline.

INIT_USER_NOINTERPOLATION_DATA

TYPE — type of the user data

NAME — name of the user data

Initializes user data that won’t be interpolated between vertices but still will be passed through shader pipeline.

INIT_BASE_DATA initializes the following set of semantics:

Name	Type	Description	Access
INIT_POSITION	float4	Adds position
INIT_FRONTFACE	bool	Adds an input semantic indicating primitive face (frontface or not).	(none)
INIT_DATA_POSITION	float3	Adds view-space position.
INIT_DATA_OBLIQUE_FRUSTUM	float	Adds oblique frustum.	(none)
INIT_DATA_ALPHA_FADE	float	Adds alpha fade.	(none)
INIT_DATA_TESSELLATION_FACTOR	float	Adds tessellation factor. Requires tessellation enabled.
INIT_DATA_TESSELLATION_MIP	float	Adds a custom tessellation mip semantic. Requires tessellation enabled.	(none)
INIT_DATA_TESSELLATION_SCALE	float	Adds a custom tessellation scale semantic. Requires tessellation enabled.	(none)
INIT_DATA_UV	float4	Adds a custom uv coordinate semantic.
INIT_DATA_NEW_POSITION	float3	Adds a custom new position semantic. Updates automatically.	(none)
INIT_DATA_OLD_POSITION	float3	Adds a custom old position semantic. Updates automatically.	(none)
INIT_DATA_COLOR	float4	Adds a custom color semantic.
INIT_DATA_BINORMAL	float3	Adds a custom binormal semantic.
INIT_DATA_NORMAL	float3	Adds a custom normal semantic.
INIT_DATA_SIGN_BINORMAL	float	Adds a custom binormal sign semantic.

vertex#

Performs operations (e.g., transformations) on individual vertices received from the Input Assembler stage. You can use the provided Input data to modify Output data.

Input Data#

Name	Type	Description
VERTEX_IN_POSITION	float3	Vertex position in object space
VERTEX_IN_UV	float4	UV coordinates of the vertex
VERTEX_IN_COLOR	float4	Color of the vertex
VERTEX_IN_BASIS	float4	Basis quaternion in space. Updates automatically to correctly calculate velocity.
VERTEX_IN_TANGENT	float3	Tangent of the basis in object space. Updates automatically to correctly calculate velocity.
VERTEX_IN_BINORMAL	float3	Binormal of the basis in object space. Updates automatically to correctly calculate velocity.
VERTEX_IN_NORMAL	float3	Normal of the basis in object space. Updates automatically to correctly calculate velocity.
DATA_SIGN_BINORMAL	float	Sign of the binormal in object space.
VERTEX_IN_TRANSFORM	float4x4	Transforms from object space to view space.
VERTEX_IN_MODELVIEW	float4x4	Transforms from world space to view space. Updates automatically to correctly calculate velocity.
VERTEX_IN_IMODELVIEW	float4x4	Transforms from view space to world space. Updates automatically to correctly calculate velocity.
VERTEX_IN_INSTANCE	uint	Object’s batched instance ID.
VERTEX_IN_TIME	float	Current global engine time elapsed since the engine initialization in ms. Updates automatically to correctly calculate velocity.
VERTEX_IN_GAME_TIME	float	Current game time that relates to Game::setScale and Game::setIFps. Updates automatically to correctly calculate velocity.

Use these variables as they are automatically updated during the material processing (for example, due to velocity calculations the vertex shader is executed twice).

Output Data#

Name	Type	Description
DATA_POSITION	float3	Vertex position in view space
DATA_TANGENT	float3	Vertex tangent in view space
DATA_BINORMAL	float3	Vertex binormal in view space
DATA_NORMAL	float3	Vertex normal in view space
DATA_UV	float4	Contains a set of vertex UV coordinates: xy — base UV zw — lightmap UV
DATA_COLOR	float4	Vertex RGBA color
DATA_TESSELLATION_FACTOR	float	Mesh tessellation factor. Available only when tessellation state is enabled.

evaluate#

All tessellated vertex data get interpolated here.

Input Data#

Notice
						Use prefix IN_EVAL_ instead of IN_ (e.g. IN_EVAL_DATA_POSITION(index)) in order to get a non-interpolated value for the specific vertex of the current patch, where index is a triangle vertex index ranging from 0 to 2.
All IN_#DATA_NAME here will implicitly call IN_INTERPOLATE_DATA().

					

Functions#

Notice

Texture sampling functions take into account the DATA_TESSELLATION_MIP.

Name	Arguments	Description
TEXTURE	Name — name of the texture slot UV — texture uv value	Samples a texture.
TEXTURE_MIP_OFFSET	Name — name of the texture slot UV — texture uv value Offset — texture uv offset value	Samples a texture with mipmap offset.

Name

Arguments

Description

TEXTURE

Name — name of the texture slot

UV — texture uv value

Samples a texture.

TEXTURE_MIP_OFFSET

Name — name of the texture slot

UV — texture uv value

Offset — texture uv offset value

Samples a texture with mipmap offset.

fragment#

Produces color values for each interpolated pixel fragment. You can use the provided Input data to modify Output data.

Input Data#

Name	Type	Description
DATA_NORMAL	float3	Normal in view space
DATA_BINORMAL	float3	Binormal in view space
DATA_TANGENT	float3	Tangent in view space
DATA_UV	float4	A set of UV coordinates xy — base UV zw — lightmap UV
DATA_COLOR	float4	Vertex color
DATA_ALPHA_FADE	float	Alpha fade value

Output Data#

NoticeFor Alpha Test and Transparent materials (in one of the following passes: Deferred, Auxiliary, Shadow), opacity threshold discards pixel if opacity <= threshold.

Name	Type	Default	Description
OUT_FRAG_ALBEDO	float3	(0, 0, 0)	GBuffer albedo color modifier
OUT_FRAG_OPACITY	float	1	Alpha of the current pixel
OUT_FRAG_OPACITY_THRESHOLD	float	0.5	Opacity threshold
OUT_FRAG_METALNESS	float	0	GBuffer metalness value
OUT_FRAG_ROUGHNESS	float	0	GBuffer roughness value
OUT_FRAG_SPECULAR	float	0	GBuffer specular value
OUT_FRAG_MICROFIBER	float	0	GBuffer microfiber value
OUT_FRAG_NORMAL	float3	DATA_NORMAL	Normal in view space
OUT_FRAG_TRANSLUCENT	float	0	GBuffer translucent value
OUT_FRAG_BEVEL	float	0	Bevel radius
OUT_FRAG_CAVITY	float	0	Cavity mask
OUT_FRAG_CONVEXITY	float	0	Convexity mask
OUT_FRAG_EMISSION	float3	(0, 0, 0)	Emission color value (requires enabled emission)
OUT_FRAG_AUXILIARY	float4	(0, 0, 0, 0)	Auxiliary color value (requires enabled auxiliary)
OUT_FRAG_DELTA_DEPTH	float	0	Delta depth (requires enabled custom_depth)

Usage Examples#

Normal Mapping#

ULON

BaseMaterial <parent=Unigine::mesh>
{
	Texture2D normal = "core/textures/post_filter_wet_normal.dds"
	
	Color albedo = [1 1 1 1]
	
	// optimization
	State static_shadow = true
	State vertex_velocity = false
	
	Shader vertex_struct =
	#{
		INIT_BASE_DATA
	#}
	
	Shader common =
	#{
		float3 color_to_normal_ts(float4 color)
		{
			float3 normal;
			normal.xy = color.xy * 2.0f - float2_one;
			normal.z = sqrt(saturate(1.0f - length(normal.xy)));
			return normalize(normal);
		}

		float3 sample_normalmap(float2 uv, float3x3 rotate_view_to_tangent)
		{
			float4 normalmap = TEXTURE(tex_normal, uv);
			float3 normal = color_to_normal_ts(normalmap);
			return mul3(normal, rotate_view_to_tangent);
		}
	#}
	
	Shader fragment =
	#{
		const float3x3 rotate_view_to_tangent = matrix3Row(DATA_TANGENT, DATA_BINORMAL, DATA_NORMAL);
		
		OUT_FRAG_ALBEDO = var_albedo.rgb;
		OUT_FRAG_SPECULAR = 0.5f;
		OUT_FRAG_ROUGHNESS = 1.0f;
		OUT_FRAG_METALNESS = 0.0f;
		OUT_FRAG_NORMAL = sample_normalmap(DATA_UV.xy, rotate_view_to_tangent);
	#}
}

Albedo Texture#

ULON

BaseMaterial <parent=Unigine::mesh>
{
	Texture2D albedo = "core/textures/common/checker_d.dds"
	Color albedo = [1 1 1 1]
	
	// optimization
	State static_shadow = true
	State vertex_velocity = false
	
	Shader vertex_struct =
	#{
		INIT_BASE_DATA
	#}
	
	Shader common =
	#{
		float3 sample_albedo(float2 uv)
		{
			return TEXTURE(tex_albedo, uv).rgb * var_albedo.rgb;
		}
	#}
	
	Shader fragment =
	#{
		OUT_FRAG_ALBEDO = sample_albedo(DATA_UV.xy);
		OUT_FRAG_SPECULAR = 0.5f;
		OUT_FRAG_ROUGHNESS = 1.0f;
		OUT_FRAG_METALNESS = 0.0f;
	#}
}

Last update: 16.08.2024

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Mesh

In This Article:

Features#

Engine#

Post Processing#

Specular AA#

Tessellation#

Shaders#

common#

vertex_struct#

vertex#

Input Data#

Output Data#

evaluate#

Input Data#

Functions#

fragment#

Input Data#

Output Data#

Usage Examples#

Normal Mapping#

Albedo Texture#