Ops ⟩ Gl ⟩ Shader ⟩ MatCapMaterial_v3

MatCapMaterial_v3 Op

Easy to use image based lighting Material

In 3D computer graphics, the appearance of an 3D object depends on several things: the surface normals (which determine how the object is shaded); the point from which the object is viewed; the lighting setup (orientation and types of lights); and how the surface reacts to that lighting (for example, how shiny it is). MatCap (Material Capture, also known as LitSphere) are complete materials, including lighting and reflections, so you can add it to an object and not have any need for, well, lighting and reflections. MatCaps allows you to create a surface material and lighting environment simply by painting an object so that it looks like how you want your surface to appear. This opens up all sorts of interesting possibilities for non-photoreal image rendering. The key to using a MatCap texture is that is is mapped to the object’s normals (which exist in relation to the camera) defining a color for every vertex normal direction relative to the camera, and your material is set to shadeless (because you don’t need lights to have any influence, as they are a part of the MatCap texture). So as the camera moves around the object, the reflections and highlights move around your object (as if the object were moving and not the camera). In other words, if your object were a sphere, no matter how you looked at it, it would look like the matcap sphere (reflections always in the same place, e.g.). But as your object takes non-spherical shapes, thus changing the normals, the material responds as if it were made of the complex material. MatCap is most commonly used for sculpting, as it gives quick and useful feedback on how an objects shape is changing. It also works with rendering, to an extent (good when you need to do a quick show-off-your-model render and don’t have time to set up any complex lights or materials). It's very cheap, and looks great when the camera doesn't rotate. Text taken from <a href="https://github.com/nidorx/matcaps">https://github.com/nidorx/matcaps</a> Be sure to check out the repository to find a huge archive of matcaps! Use at your own risk :)

Full Name

Ops.Gl.Shader.MatCapMaterial_v3

Visibility

Core Op - Official cables op

License

Author

simod

github

source

Test Patches

4 Tests

Documentation (markdown)

In 3D computer graphics, the appearance of an 3D object depends on several things:

the surface normals (which determine how the object is shaded);
the point from which the object is viewed;
the lighting setup (orientation and types of lights);
and how the surface reacts to that lighting (for example, how shiny it is).
MatCap (Material Capture, also known as LitSphere) are complete materials, including lighting and reflections, so you can add it to an object and not have any need for, well, lighting and reflections. MatCaps allows you to create a surface material and lighting environment simply by painting an object so that it looks like how you want your surface to appear. This opens up all sorts of interesting possibilities for non-photoreal image rendering.

The key to using a MatCap texture is that is is mapped to the object’s normals (which exist in relation to the camera) defining a color for every vertex normal direction relative to the camera, and your material is set to shadeless (because you don’t need lights to have any influence, as they are a part of the MatCap texture). So as the camera moves around the object, the reflections and highlights move around your object (as if the object were moving and not the camera). In other words, if your object were a sphere, no matter how you looked at it, it would look like the matcap sphere (reflections always in the same place, e.g.). But as your object takes non-spherical shapes, thus changing the normals, the material responds as if it were made of the complex material.

MatCap is most commonly used for sculpting, as it gives quick and useful feedback on how an objects shape is changing. It also works with rendering, to an extent (good when you need to do a quick show-off-your-model render and don’t have time to set up any complex lights or materials). It's very cheap, and looks great when the camera doesn't rotate.

Text taken from https://github.com/nidorx/matcaps

Be sure to check out the repository to find a huge archive of matcaps!

Use at your own risk :)

Example Patch MatCapMaterialNew - Example

Open In Editor

Youtube Video Tutorial

INPUT PORTS

Render (Trigger)

trigger input

MatCap (Object:texture)

matcap texture input

Texture Maps

Diffuse (Object:texture)

diffuse texture input

Normal (Object:texture)

normal map input

Specular Mask (Object:texture)

specular mask input

Specular MatCap (Object:texture)

specular matcap input

AO Texture (Object:texture)

AO texture input

Opacity Texture (Object:texture)

opacity texture input

Color

r (Number)

R channel of diffuse color

g (Number)

G channel of diffuse color

b (Number)

B channel of diffuse color

Opacity (Number)

Alpha channel of diffuse color

Texture Transforms

AO Intensity (Number)

Intensity of AO texture

Normal Map Intensity (Number)

Intensity of Normal Map

Repeat X (Number)

Texture Repeat along the x-axis

Repeat Y (Number)

Texture Repeat along the y-axis

Offset X (Number)

Texture Coordinate offset along the x-axis

Offset Y (Number)

Texture Coordinate offset along the y-axis

Normals

Double Sided (Number:boolean
)

Screen Space Normals (Number:boolean
)

check to use screen space normals (flat shading)

Calc normal tangents (Number:boolean
)

calculate normals & tangents

Texture Opacity

Opacity TexCoords Transform (Number:boolean
)

invert y-axis of opacity texture texture coordinates

Discard Transparent Pixels (Number:boolean
)

discard transparent pixels under a threshold of 0.2

Alpha Mask Source index (Number:integer
) Luminance R G B A

switch to choose which channel of the texture should be used for alpha mapping

OUTPUT PORTS

Next (Trigger)

output trigger

Shader (Object)

shader output

Patches using MatCapMaterial_v3

Examples
Team
Public
My Patches
My Ops

Changelog

	created op	simod - 2020-09-09 17:13
improvement	double sided toggle	pandur - 2024-09-10 07:30