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Now let's cover the steps to use this approach.

no anti-aliasing (TextGeometryВ is addedВ as anВ overlayВ whichВ skipsВ FXAAВ post-processing)Д«elow we can seeВ the tesselation of the geometry, forming theВ letters through triangle meshes.

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ie.В DonвЂ™tВ displayВ aВ pdfВ page full ofВ text on the screen. Too many characters on the screen can impactВ renderВ performance.YouвЂ™llВ have to recreate that withВ Ray-hitВ testing Those convenientВ DIV elements onClick & onMouse eventsВ donвЂ™tВ exist.CSS Styling makes adding colors,В borders, shadowsВ &В gradientsВ easy вЂ“В thatвЂ™sВ gone.AddВ complex textures/materialsВ to the text.To get better quality fonts, use higherВ tessellation.ThereВ areВ noВ badВ alignmentВ problemsВ or zoom-inВ problems,В likeВ theВ DIVВ approachВ above.

itВ canВ hideВ behindВ chairs, fences, doors,В floors,В robots.В anything.

ItвЂ™s 3D Text, so itВ becomes part ofВ theВ 3DВ scene.

RenderingВ isВ simpler,В both labels and 3D areВ nowВ handled by three.js.

What if we create text as three.jsВ geometry?В We do this byВ creating a three.jsВ shape forВ eachВ fontвЂ™sВ character. Now, letВ usВ look atВ an alternative approach. There are issues with zooming,В resizing,В and embedding iframeвЂ™s that adds effort

Keeping the 2D HTML scene, aligned with the three.jsВ sceneВ is hard.

(We address this inВ Part2 blog postВ with CSS3D)

Labels are stuck вЂin frontвЂ™ of everything.В ThereвЂ™sВ noВ partialВ occluding a label,В ie.В behind a chair.

Too many DIV elements, slow rendering down.

Highest quality anti-aliased fonts, zeroВ tessellation.

DIV can embedВ complex content, like videoвЂ™s, gifвЂ™s, multi-line styled text.

The convenience of CSS stylingВ makes changingВ colors,В bordersВ andВ shadows,В easy.

The convenience of HTML onClick,В MouseOverВ makes вЂњHit-testingвЂќВ easy.

ThereвЂ™sВ more.В Let'sВ summarize theВ prosВ andВ cons:

We canВ improve theВ DIV LabelВ speed,В a little, by using вЂfixedвЂ™ CSS positioning, to get GPU acceleration, butВ unfortunately, theВ over-drawВ inefficiencies,В cannot be avoided. That isВ a slow technique, but very convenientВ вЂ“В ItвЂ™sВ slowВ because theВ DIV LabelsВ layerВ (HTMLВ renderedВ byВ Skia)В isВ drawn over the top ofВ the 3DВ WebGLВ layerВ (renderedВ by three.js).В This causes over-draw. WeВ moveВ theВ labels (DIV)В x,yВ position every frame, based on a calculation (re-projecting aВ 3D pointВ fromВ three.jsВ to theВ 2D viewport). The HTML canvas isВ renderedВ aboveВ the Forge-ViewerВ webGL layer. The HTML elementsВ techniqueВ changes the Top/Left values of aВ DIV/SVG element.

Meanwhile, PhilippeвЂ™s post usesВ SVG elements,В soВ demonstrates SVGВ animations.

MichaelвЂ™s blog usedВ the same thing butВ addedВ millionsВ ofВ POIвЂ™s.

AugustoвЂ™s blog Placing custom markup by dbIdВ uses DIV elements to place labels on pipes and factory equipment.

The first approach, HTML elements,В has been posted before.

HTML elements on top ofВ the modelВ (SVG, DIV).

Let'sВ start byВ summarizingВ three popularВ options: In thisВ ThreeВ partВ blogВ series, we are going to cover all things вЂњlabelsвЂќ, including past blogs and techniques.

Add measurements to aВ ManufacturedВ part, withВ 3DВ markupВ annotations?.

popup aВ live-feedВ video,В next to the securityВ cameraВ geometry?.

Label all the desks and chairs in a room with floatingВ labels?.

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In this part, we'll be focusing more on how to add text geometry as labels into Forge Viewer.

Autodesk viewer step download series#

This will be the first of a series of three blog posts covering methods for adding labels to your models.