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feat: linotcut (#170)
* add demo and doc * lint --------- Co-authored-by: Alvaro Saburido <alvaro.saburido@gmail.com>
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‎docs/.vitepress/config.ts‎

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@@ -51,6 +51,7 @@ export default defineConfig({
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{ text: 'Barrel blur', link: '/guide/pmndrs/barrel-blur' },
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{ text: 'Bloom', link: '/guide/pmndrs/bloom' },
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{ text: 'Chromatic Aberration', link: '/guide/pmndrs/chromatic-aberration' },
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{ text: 'Linocut', link: '/guide/pmndrs/linocut' },
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{ text: 'Sepia', link: '/guide/pmndrs/sepia' },
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{ text: 'Vignette', link: '/guide/pmndrs/vignette' },
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{ text: 'Hue & Saturation', link: '/guide/pmndrs/hue-saturation' },

‎docs/.vitepress/theme/components/pmdrs/LinocutDemo.vue‎

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<script setup lang="ts">
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import { ContactShadows, Environment, OrbitControls } from '@tresjs/cientos'
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import { TresCanvas } from '@tresjs/core'
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import { TresLeches, useControls } from '@tresjs/leches'
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import { EffectComposerPmndrs, LinocutPmndrs } from '@tresjs/post-processing'
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import { BlendFunction } from 'postprocessing'
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import { NoToneMapping } from 'three'
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import '@tresjs/leches/styles'
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const gl = {
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clearColor: '#00ff00',
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toneMapping: NoToneMapping,
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multisampling: 8,
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envMapIntensity: 10,
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}
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const { blendFunction, scale, noiseScale, centerX, centerY, rotation } = useControls({
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scale: { value: 0.85, step: 0.01, min: 0, max: 2 },
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noiseScale: { value: 0.0, step: 0.01, min: 0, max: 1 },
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centerX: { value: 0.5, step: 0.01, min: 0, max: 1 },
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centerY: { value: 0.5, step: 0.01, min: 0, max: 1 },
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rotation: { value: 0.0, step: 0.01, min: -Math.PI, max: Math.PI },
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blendFunction: {
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options: Object.keys(BlendFunction).map(key => ({
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text: key,
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value: BlendFunction[key as keyof typeof BlendFunction],
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})),
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value: BlendFunction.NORMAL,
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},
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})
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</script>
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<template>
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<TresLeches style="left: initial;right:10px; top:10px;" />
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<TresCanvas
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v-bind="gl"
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>
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<TresPerspectiveCamera
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:position="[0, 6.5, 6.5]"
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/>
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<OrbitControls auto-rotate />
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<TresMesh>
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<TresBoxGeometry :args="[2, 2, 2]" />
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<TresMeshStandardMaterial color="yellow" />
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</TresMesh>
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<Suspense>
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<Environment :blur=".25" preset="snow" />
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</Suspense>
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<ContactShadows
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:opacity=".65"
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:position-y="-1"
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:scale="35"
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:blur="1"
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/>
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<Suspense>
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<EffectComposerPmndrs>
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<LinocutPmndrs
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:scale="scale.value"
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:noiseScale="noiseScale.value"
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:center="[centerX.value, centerY.value]"
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:rotation="rotation.value"
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:blendFunction="Number(blendFunction.value)"
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/>
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</EffectComposerPmndrs>
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</Suspense>
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</TresCanvas>
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</template>

‎docs/components.d.ts‎

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HueSaturationDemo: typeof import('./.vitepress/theme/components/pmdrs/HueSaturationDemo.vue')['default']
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KuwaharaDemo: typeof import('./.vitepress/theme/components/pmdrs/KuwaharaDemo.vue')['default']
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LensDistortionDemo: typeof import('./.vitepress/theme/components/pmdrs/LensDistortionDemo.vue')['default']
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LinocutDemo: typeof import('./.vitepress/theme/components/pmdrs/LinocutDemo.vue')['default']
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LoveVueThreeJS: typeof import('./.vitepress/theme/components/LoveVueThreeJS.vue')['default']
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NoiseDemo: typeof import('./.vitepress/theme/components/pmdrs/NoiseDemo.vue')['default']
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OutlineDemo: typeof import('./.vitepress/theme/components/pmdrs/OutlineDemo.vue')['default']

‎docs/guide/pmndrs/linocut.md‎

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# Linocut
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<DocsDemo>
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<LinocutDemo />
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</DocsDemo>
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The `Linocut` effect is a custom shader effect inspired by traditional linocut and woodcut printmaking. It transforms the scene into a high-contrast black-and-white composition, featuring bold lines and intricate patterns that replicate the handcrafted aesthetic of relief printing techniques.
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## Usage
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The `<LinocutPmndrs>` component is straightforward to use and provides customizable options to fine-tune the linocut effect.
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```vue{4,12-18,38-42}
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<script setup lang="ts">
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import { TresCanvas } from '@tresjs/core'
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import { Environment, OrbitControls } from '@tresjs/cientos'
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import { EffectComposerPmndrs, LinocutPmndrs } from '@tresjs/post-processing'
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const gl = {
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clearColor: '#4f4f4f',
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toneMapping: NoToneMapping,
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multisampling: 8,
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}
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const effectProps = reactive({
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scale: 0.85,
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noiseScale: 0.0,
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center: [0.5, 0.5],
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rotation: 0.0,
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blendFunction: BlendFunction.NORMAL,
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})
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</script>
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<template>
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<TresCanvas v-bind="gl">
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<TresPerspectiveCamera
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:position="[0, 6.5, 6.5]"
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:look-at="[0, 0, 0]"
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/>
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<OrbitControls auto-rotate />
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<Suspense>
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<Environment preset="shangai" />
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</Suspense>
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<TresMesh>
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<TresBoxGeometry :args="[2, 2, 2]" />
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<TresMeshStandardMaterial color="yellow" />
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</TresMesh>
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<Suspense>
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<EffectComposerPmndrs>
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<LinocutPmndrs v-bind="effectProps" />
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</EffectComposerPmndrs>
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</Suspense>
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</TresCanvas>
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</template>
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```
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## Props
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| Prop | Description | Default |
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| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------ |
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| **scale** | Line width control. A value between 0 and 1. | `0.85` |
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| **noiseScale** | Noise intensity. A value between 0 and 1. | `0.0` |
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| **center** | Center of rotation (normalized coordinates). A `Vector2` value or an array of two numbers where both values are between 0 and 1. | `[0.5, 0.5]` |
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| **rotation** | Rotation angle (in radians). A value between -π and π. | `0.0` |
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| **blendFunction** | Defines how the effect blends with the original scene. See the [`BlendFunction`](https://pmndrs.github.io/postprocessing/public/docs/variable/index.html#static-variable-BlendFunction) options. | `BlendFunction.NORMAL` |
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## Further Reading
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For an example of the linocut effect in WebGL, see the [Linocut Effect on Shadertoy](https://www.shadertoy.com/view/4XVcDV).

‎playground/src/pages/postprocessing/linocut.vue‎

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<script setup lang="ts">
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import { ContactShadows, Environment, OrbitControls } from '@tresjs/cientos'
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import { TresCanvas } from '@tresjs/core'
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import { TresLeches, useControls } from '@tresjs/leches'
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import { NoToneMapping } from 'three'
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import { BlendFunction } from 'postprocessing'
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import { EffectComposerPmndrs, LinocutPmndrs } from '@tresjs/post-processing'
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import '@tresjs/leches/styles'
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const gl = {
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clearColor: '#00ff00',
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toneMapping: NoToneMapping,
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multisampling: 8,
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envMapIntensity: 10,
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}
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const { blendFunction, scale, noiseScale, centerX, centerY, rotation } = useControls({
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scale: { value: 0.85, step: 0.01, min: 0, max: 1 },
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noiseScale: { value: 0.0, step: 0.01, min: 0, max: 1 },
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centerX: { value: 0.5, step: 0.01, min: 0, max: 1 },
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centerY: { value: 0.5, step: 0.01, min: 0, max: 1 },
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rotation: { value: 0.0, step: 0.01, min: -Math.PI, max: Math.PI },
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blendFunction: {
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options: Object.keys(BlendFunction).map(key => ({
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text: key,
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value: BlendFunction[key as keyof typeof BlendFunction],
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})),
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value: BlendFunction.NORMAL,
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},
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})
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</script>
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<template>
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<TresLeches />
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<TresCanvas
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v-bind="gl"
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>
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<TresPerspectiveCamera
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:position="[0, 6.5, 6.5]"
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/>
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<OrbitControls auto-rotate />
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<TresAmbientLight :intensity="1" />
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<TresMesh>
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<TresBoxGeometry :args="[2, 2, 2]" />
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<TresMeshStandardMaterial color="yellow" :roughness=".5" :metalness="1" />
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</TresMesh>
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<Suspense>
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<Environment :blur=".25" preset="snow" />
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</Suspense>
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<ContactShadows
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:opacity=".65"
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:position-y="-1"
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:scale="35"
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:blur="1"
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/>
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<Suspense>
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<EffectComposerPmndrs>
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<LinocutPmndrs
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:scale="scale.value"
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:noiseScale="noiseScale.value"
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:center="[centerX.value, centerY.value]"
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:rotation="rotation.value"
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:blendFunction="Number(blendFunction.value)"
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/>
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</EffectComposerPmndrs>
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</Suspense>
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</TresCanvas>
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</template>

‎playground/src/router.ts‎

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makeRoute('Bloom', '🌼', false),
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makeRoute('Noise', '📟', false),
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makeRoute('Chromatic Aberration', '🌈', false),
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makeRoute('Linocut', '🪵', false),
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makeRoute('Color Average', '🎞️', false),
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makeRoute('Lens Distortion', '🔍', false),
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makeRoute('Sepia', '🌅', false),

‎src/core/pmndrs/LinocutPmndrs.vue‎

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<script lang="ts" setup>
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import type { BlendFunction } from 'postprocessing'
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import { LinocutEffect } from './custom/linocut/index'
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import { makePropWatchers } from '../../util/prop'
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import { useEffectPmndrs } from './composables/useEffectPmndrs'
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import { Vector2 } from 'three'
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export interface LinocutPmndrsProps {
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blendFunction?: BlendFunction
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scale?: number
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noiseScale?: number
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center?: Vector2 | [number, number]
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rotation?: number
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}
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const props = defineProps<LinocutPmndrsProps>()
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const { pass, effect } = useEffectPmndrs(
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() => new LinocutEffect({
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...props,
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center: Array.isArray(props.center) ? new Vector2().fromArray(props.center) : props.center,
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}),
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props,
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)
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defineExpose({ pass, effect })
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makePropWatchers(
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[
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[() => props.blendFunction, 'blendMode.blendFunction'],
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[() => props.scale, 'scale'],
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[() => props.noiseScale, 'noiseScale'],
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[() => props.center, 'center'],
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[() => props.rotation, 'rotation'],
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],
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effect,
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() => new LinocutEffect(),
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)
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</script>

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