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# v-log | ||
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### Problem | ||
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When you have to log your instance you have to use the template reference and then log them: | ||
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```vue{3} | ||
<script setup lang="ts"> | ||
import { shallowRef, watch } from 'vue' | ||
const sphereRef = shallowRef() | ||
watch(sphereRef, value => { | ||
console.log(value) // Really for a log?!!! 😫 | ||
}) | ||
</script> | ||
<template> | ||
<TresCanvas > | ||
<TresPerspectiveCamera :position="[0, 2, 5]" /> | ||
<Sphere | ||
ref="sphereRef" | ||
:scale="0.5" | ||
/> | ||
<OrbitControls /> | ||
</TresCanvas> | ||
</template> | ||
``` | ||
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And is A LOT of code just for a simple log right? | ||
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## Solution | ||
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With the new directive v-log provided by **TresJS**, you can do this by just adding `v-log` to the instance. | ||
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```vue{3} | ||
<script setup lang="ts"> | ||
import { OrbitControls, Sphere, vLog } from '@tresjs/cientos' | ||
</script> | ||
<template> | ||
<TresCanvas > | ||
<TresPerspectiveCamera :position="[0, 2, 5]" /> | ||
<Sphere | ||
ref="sphereRef" | ||
:scale="0.5" | ||
v-log:material <!-- will print just the material 🎉 --> | ||
/> | ||
<OrbitControls v-log /> | ||
</TresCanvas> | ||
</template> | ||
``` | ||
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Note that you can pass a modifier with the name of a property, for example `v-log:material`, and will log directly the `material` property 😍 | ||
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::: warning | ||
The component `<TresCanvas >` will no log the canvas nor the scene | ||
::: |
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<script setup lang="ts"> | ||
import { reactive, shallowRef } from 'vue' | ||
import { TresCanvas, useRenderLoop } from '@tresjs/core' | ||
import { OrbitControls, Stars, Sphere, vLog } from '@tresjs/cientos' | ||
import { SRGBColorSpace, NoToneMapping } from 'three' | ||
const gl = { | ||
clearColor: '#333', | ||
outputColorSpace: SRGBColorSpace, | ||
toneMapping: NoToneMapping, | ||
} | ||
const options = reactive({ | ||
size: 0.1, | ||
sizeAttenuation: true, | ||
count: 5000, | ||
depth: 50, | ||
radius: 100, | ||
}) | ||
const sphereRef = shallowRef() | ||
const { onLoop } = useRenderLoop() | ||
onLoop(({ elapsed }) => { | ||
if (sphereRef.value) { | ||
sphereRef.value.value.position.y = Math.sin(elapsed) * 0.5 | ||
} | ||
}) | ||
</script> | ||
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<template> | ||
<TresCanvas v-bind="gl"> | ||
<TresPerspectiveCamera :position="[0, 2, 5]" /> | ||
<Stars | ||
:radius="options.radius" | ||
:depth="options.depth" | ||
:count="options.count" | ||
:size="options.size" | ||
:size-attenuation="options.sizeAttenuation" | ||
/> | ||
<Sphere | ||
ref="sphereRef" | ||
v-log:material | ||
:scale="0.5" | ||
/> | ||
<TresGridHelper :args="[10, 10]" /> | ||
<OrbitControls /> | ||
</TresCanvas> | ||
</template> |
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<template> | ||
<Suspense> | ||
<ModelsDemo /> | ||
<DirectivesDemo /> | ||
</Suspense> | ||
</template> |
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import { vLog } from './vLog' | ||
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export { vLog } |
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export const vLog = { | ||
updated: (el: any, binding: any) => { | ||
if (binding.arg) { | ||
// eslint-disable-next-line no-console | ||
console.log(`v-log:${binding.arg}`, el[binding.arg]) | ||
return | ||
} | ||
// eslint-disable-next-line no-console | ||
console.log('v-log', el) | ||
}, | ||
} |
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