58 lines
1.8 KiB
JavaScript
58 lines
1.8 KiB
JavaScript
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xrf.frag.uv = function(v, opts){
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let { frag, mesh, model, camera, scene, renderer, THREE} = opts
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if( !mesh.geometry ) return // nothing to do here
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xrf.frag.uv.init(mesh)
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mesh.uv.x = v.x
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mesh.uv.y = v.y !== undefined ? v.y : v.x
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mesh.onBeforeRender = xrf.frag.uv.scroll
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}
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xrf.frag.uv.init = function(mesh){
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if( !mesh.uv ) mesh.uv = {x:0, y:0, w:1, h:1, uv:false}
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if( !mesh.suv ) mesh.suv = {x:1, y:1, loop:false }
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let uv = mesh.geometry.getAttribute("uv")
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if( !uv.old ) uv.old = uv.clone()
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}
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xrf.frag.uv.scroll = function(){
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if( this.suv.x > 0.0 || this.suv.y > 0.0 ){
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let diff = 0.0 // distance to end-state (non-looping mode)
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let uv = this.geometry.getAttribute("uv")
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// translate!
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for( let i = 0; i < uv.count; i++ ){
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let u = uv.getX(i)
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let v = uv.getY(i)
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let uTarget = uv.old.getX(i) + this.uv.x
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let vTarget = uv.old.getY(i) + this.uv.y
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if( this.suv.loop ){
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u += this.suv.x * xrf.clock.delta
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v += this.suv.y * xrf.clock.delta
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}else{
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// recover from super-high uv-values due to looped scrolling
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if( Math.abs(u-uTarget) > 1.0 ) u = uv.old.getX(i)
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if( Math.abs(v-vTarget) > 1.0 ) v = uv.old.getY(i)
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u = u > uTarget ? u + (this.suv.x * -xrf.clock.delta)
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: u + (this.suv.x * xrf.clock.delta)
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v = v > vTarget ? v + (this.suv.y * -xrf.clock.delta)
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: v + (this.suv.y * xrf.clock.delta)
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diff += Math.abs( u - uTarget ) // are we done yet? (non-looping mode)
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diff += Math.abs( v - vTarget )
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}
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uv.setXY(i,u,v)
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}
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uv.needsUpdate = true
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if( !this.suv.loop && diff < 0.05 ){ // stop animating if done
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this.onBeforeRender = function(){}
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}
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}
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}
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