Spatial Material — Godot Engine (3.0) documentation in English (2024)

Transparent¶

In Godot, materials are not transparent unless specifically toggled as such.The main reason behind this is that transparent materials are renderedusing a different technique (sorted from back to front and rendered in order).

This technique is less efficient (many state changes happen) and makes the materialsunusable with many mid and post processing effects (such as SSAO, SSR, etc) thatrequire perfectly opaque geometry.

For this reason, materials in Godot are assumed opaque unless specified otherwise.The main settings that enable transparency are:

• Transparent flag (this one)
• Blend mode set to other than Mix
• Enabling distance or proximity fade

Unshaded¶

In most cases, it is common for materials to be affected by lighting (shaded).

Sometimes, however, one might want to show just the albedo (color) and ignore the rest. Toggling this flag on will remove allshading and show pure, unlit, color.

Vertex Lighting¶

Godot has a more or less uniform cost per pixel (thanks to depth pre pass). All lighting calculations are madeby running the lighting shader on every pixel.

As these calculations are costly, performance can be brought down considerably in some corner cases such as drawingseveral layers of transparency (common in particle systems). Switching to per vertex lighting may help these cases.

Additionally, on low-end or mobile devices, switching to vertex lighting can considerably increase rendering performance.

Keep in mind that when vertex lighting is enabled, only directional lighting can produce shadows (for performance reasons).

No Depth Test¶

In order for close objects to appear over far away objects, depth testing is performed.Disabling it has the result of objects appearing over (or under) everything else.

Disabling this makes the most sense for drawing indicators in world space, and worksvery well with the “render priority” property of Material (see bottom).

Use Point Size¶

This option is only active when the geometry rendered is made of points(it generally is just made of triangles when imported from 3D DCCs).If so, then points can be sized (see below).

World Triplanar¶

When using triplanar mapping (see below, in the UV1 and UV2 settings) triplanaris computed in object local space. This option makes triplanar work in world space.

Fixed Size¶

Makes the object rendered at the same size no matter the distance. This is, again,useful mostly for indicators (no depth test and high render priority) and some types of billboards.

Do Not Receive Shadows¶

Makes the object not receive any kind of shadow that would otherwise be cast onto it.

Use as Albedo¶

Vertex color is used as albedo color.

Is SRGB¶

Most 3D DCCs will likely export vertex colors as SRGB, so toggling this option on will help themlook correct.

Diffuse Mode¶

Specifies the algorithm used by diffuse scattering of light when hitting the object. Thedefault one is Burley. Other modes are also available:

• Burley: Default mode, the original Disney Principled PBS diffuse algorithm.
• Lambert: Is not affected by roughness.
• Lambert Wrap: Extends Lambert to cover more than 90 degrees when roughness increases. Works great for hair and simulating cheap subsurface scattering. This implementation is energy conserving.
• Oren Nayar: This implementation aims to take microsurfacing into account (via roughness). Works well for clay-like materials and some types of cloth.
• Toon: Provides a hard cut for lighting, with smoothing affected by roughness.

Specular Mode¶

Specifies how the specular blob will be rendered. The specular blob represents the shape of a light source reflected in the object.

• ShlickGGX: The most common blob used by PBR 3D engines nowadays.
• Blinn: Common in previous-generation engines. Not worth using nowadays but left here for the sake of compatibility.
• Phong: Same as above.
• Toon: Creates a toon blob, which changes size depending on roughness.
• Disabled: Sometimes, that blob gets in the way. Be gone!

Blend Mode¶

Controls the blend mode for the material. Keep in mind that any mode other than Mix forces the object to go through transparent pipeline.

• Mix: Default blend mode, alpha controls how much the object is visible.
• Add: Object is blended additively, nice for flares or some fire-like effects.
• Sub: Object is subtracted.
• Mul: Object is multiplied.

Cull Mode¶

Determines which side of the object is not drawn when back-faces are rendered:

• Back: Back of the object is culled when not visible (default)
• Front: Front of the object is culled when not visible
• Disabled: Used for objects that are double sided (no culling is performed)

Depth Draw Mode¶

Specifies when depth rendering must take place.

• Opaque Only (default): Depth is only drawn for opaque objects
• Always: Depth draw is drawn for both opaque and transparent objects
• Never: No depth draw takes place (note: do not confuse with depth test option above)
• Depth Pre-Pass: For transparent objects, an opaque pass is made first with the opaque parts,then transparency is drawn above. Use this option with transparent grass or tree foliage.

Line Width¶

When drawing lines, specify the width of the lines being drawn. This option is not available in most modern hardware.

Point Size¶

When drawing points, specify the point size in pixels.

Billboard Mode¶

Enables billboard mode for drawing materials. This controls how the object faces the camera:

• Disabled: Billboard mode is disabled
• Enabled: Billboard mode is enabled, object -Z axis will always face the camera.
• Y-Billboard: Object X axis will always be aligned with the camera
• Particles: When using particle systems, this type of billboard is best, because it allows specifying animation options.

Above options are only enabled for Particle Billboard.

Grow¶

Grows the object vertices in the direction pointed by their normals:

This is commonly used to create cheap outlines. Add a second material pass, make it black and unshaded, reverse culling (Cull Front), andadd some grow:

Use Alpha Scissor¶

When transparency other than 0 or 1 is not needed, it’s possible to set a threshold to avoid the object from rendering these pixels.

This renders the object via the opaque pipeline which is faster and allows it to do mid and post process effects such as SSAO, SSR, etc.

Albedo¶

Albedo is the base color for the material. Everything else works based on it.When set to unshaded this is the only color that is visible as-is.In previous versions of Godot, this channel was named diffuse. The change ofname mainly happened because, in PBR rendering, this color affects many morecalculations than just the diffuse lighting path.

Albedo color and texture can be used together as they are multiplied.

Alpha channel in albedo color and texture is also used for the object transparency.If you use a color or texture with alpha channel, make sure to either enabletransparency or alpha scissoring for it to work.

Metallic¶

Godot uses a Metallic model over competing models due to its simplicity.This parameter pretty much defines how reflective the materials is. The morereflective it is, the least diffuse/ambient light and the more reflected light.This model is called “energy conserving”.

The “specular” parameter here is just a general amount of for the reflectivity(unlike metallic, this one is not energy conserving, so simply leave it as 0.5and don’t touch it unless you need to).

The minimum internal reflectivity is 0.04, so (just like in real life) it’simpossible to make a material completely unreflective.

Roughness¶

Roughness affects mainly the way reflection happens. A value of 0 makes it aperfect mirror while a value of 1 completely blurs the reflection (simulating the natural microsurfacing).Most common types of materials can be achieved from the right combination of Metallic and Roughness.

Emission¶

Emission specifies how much light is emitted by the material (keep in mind thisdoes not do lighting on surrounding geometry unless GI Probe is used).This value is just added to the resulting final image and is not affected by other lighting in the scene.

Normalmap¶

Normal mapping allows to set a texture that represents finer shape detail.This does not modify geometry, just the incident angle for light.In Godot, only R and G are used for normalmaps, in order to attain better compatibility.

Rim¶

Some fabrics have small micro fur that causes light to scatter around it. Godotemulates this with the rim parameter. Unlike other rim lighting implementationswhich just use the emission channel, this one actually takes light into account(no light means no rim). This makes the effect considerably more believable.

Rim size depends on roughness, and there is a special parameter to specify howit must be colored. If tint is 0, the color of the light is used for the rim. If tint is 1,then the albedo of the material is used. Using intermediate values generally works best.

Clearcoat¶

The clearcoat parameter is used mostly to add a secondary pass of transparentcoat to the material. This is common in car paint and toys.In practice, it’s a smaller specular blob added on top of the existing material.

Anisotropy¶

Changes the shape of the specular blow and aligns it to tangent space. Anisotropyis commonly used with hair, or to make materials such as brushed aluminium more realistic.It works especially well when combined with flowmaps.

Ambient Occlusion¶

In Godot’s new PBR workflow, it is possible to specify a pre-baked ambient occlusion map.This map affects how much ambient light reaches each surface of the object (it does not affect direct light).While it is possible to use Screen Space Ambient Occlusion (SSAO) to generate AO,nothing will beat the quality of a nicely baked AO map. It is recommended to pre-bake AO whenever possible.

Depth¶

Setting a depth map to a material produces a ray-marched search to emulate theproper displacement of cavities along the view direction. This is not real added geometry, but an illusion of depth.It may not work for complex objets, but it produces a realistic depth effect for textues.For best results, Depth should be used together with normal mapping.

Subsurface Scattering¶

This effect emulates light that goes beneath an object’s surface, is scattered,and then comes out. It’s useful to make realistic skin, marble, colored liquids, etc.

Transmission¶

Controls how much light from the lit side (visible to light) is transferred tothe dark side (opposite side to light). This works well for thin objects such astree/plant leaves, grass, human ears, etc.

Refraction¶

When refraction is enabled, it supersedes alpha blending, and Godot attempts tofetch information from behind the object being rendered instead. This allows distorting the transparencyin a way similar to refraction.

Detail¶

Godot allows using secondary albedo and normal maps to generate a detail texture,which can be blended in many ways. Combining with secondary UV or triplanar modes,many interesting textures can be achieved.

UV1 and UV2¶

Godot supports 2 UV channels per material. Secondary UV is often useful for AO orEmission (baked light). UVs can be scaled and offseted which is useful in textures with repeat.

Triplanar Mapping¶

Triplanar mapping is supported for both UV1 and UV2. This is an alternative wayto obtain texture coordinates, often called “Autotexture”.Textures are sampled in X,Y and Z and blended by the normal.Triplanar can be either worldspace or object space.

In the image below, you can see how all primitives share the same material withworld triplanar, so bricks continue smoothly between them.