delftship tutorial01[1][1]

5/21/2018 delftship Tutorial01[1][1]

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DELFTship tutorial Using background images

DELFTship

ELFTship tutorial Using background images

ELFTship tutorial Using background images

DescriptionDescription

By using scanned images of an existing linesplan it is shown how a 3D DELFTship model can be createdusing background images. The linesplan used for this tutorial is from an old motorboat. t!s a hard chinedmotorboat with slightly cur"ed sides at the stern.During this tutorial also a lot of the basics will beexplained. #ou!ll be shown how to

$reate knuckle lines

%se background images

&ssign control cur"es

Fair control cur"es by mo"ing points with the

mouse

'o"e points with the cursor keys.

&dd new faces manually

nsert new points

nsert new edges

&dd new layers

(elect faces

&ssign faces to a different layer

&dd stations

'ake a cur"ed transom that ends perpendicular to the centerplane of the hull

1. Start a new modelDescription Action

(tart a new model Select File => Newfrom themainmenu

The window from illustration )appears. Fill in the appropriatenumbers.

IllustrationIllustration 11: Linesplan used for this tutorial: Linesplan used for this tutorial

IllustrationIllustration 22: New model window.: New model window.


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. !reating knuckle linesDescription Action

The default hull is a roundbottomed sailing boat. The

linesplan we!re trying toreproduce is a hard chinedmotorboat. The first thing we!regoing to do is create a knuckleline that is going to be thechine of our motorboat

Select the edges as shown in image3.ou can select them one b! one b!

clicking on each edge with the leftmouse button. "n easier and fasterwa! is to select #ust one edge whilekeeping the $trl ke! on !our ke!board

pressed. DELFTship automaticall!traces and selects the connectededges.

Turn the normal edges intoknuckle *crease+ edges.DELFTship draws creaseedges in red.

Select Edit => Edge => Creasefromthe mainmenu.

". #nserting background imagesDescription Action

DELFTship has three different"iews on your model

,lan *top+ "iew

,rofile *side+ "iew

Bodyplan *front+

"iew

,erspecti"e *"iew+.

#ou can assign a differentbackground image to each ofthese "ies- except for theperspecti"e "iew

Select the window showing the profile%iew. &f no such window is a%ailableselect a random one and set the %iewto profile %iew. This is done b!

pressing the right mouse buttonsomewhere in the window area. " pop'up menu appears. Select View =>rofile.

$all the pop'up menu again and select!a"#ground image => Load. Thisopens the file browser. Select the file

!ou want to use for a backgroundimage.

$. %o&ing a background imageDescription Action

The background image is nowinserted into your model. E"erytime you select the profile "iewthis image will be shown on thebackground. n most cases the

background image is not yet onthe right location immediatelyafter the import. e!re going todrag it to the correct place now.

Select !a"#ground image => $riginfrom the pop'up menu.

The cursor now changes to a crosswith a big $indication !ou(re going tochange the origin. )ress the left

mouse button somewhere on thebackground image and keep it presseddown. &f !ou mo%e the mouse aroundnow !ou(ll notice the backgroundimage being dragged around as well. &f!ou release the mouse button againthe %iewport will resume to normaloperation.

Drag the image to the correct location.&n this case the lowest point of theskeg should coincide with the baselineof !our model *+,-.-. The aft part ofthe transom should coincide with theaft perpendicular */,-.-.

)

IllustrationIllustration %%: Creating a #nu"#le line.: Creating a #nu"#le line.


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'. !hanging the scale o( a background imageDescription Action

/nce the background image ison the correct spot we still ha"e

to scale it to the correctdimensions.

Select !a"#ground image => &ets"alefrom the pop'up menu. The

cursor changes to a ruler to indicate!ou(re changing the scale of theimage. 0ow click on a point of thebackground image of which !ou knowthe e1act coordinates. The further this

point is awa! from the origin the better.

2nce a point has been selectedanother window shows up promptingfor the coordinates of the selected

point. Enter the correct coordinates inthis point and close the window.

&n our e1ample the coordinate of theuppermost point of the bow is '.()*1.'+

Important:"ll new background images will automaticall! ha%e the

same scale applied as this one. This is particularl! con%enient if !ou(reimporting multiple background images originating from the samelinesplan. So make sure !ou set the correct scale before importing thene1t background image &n our case we import the same image threetimes *once for each %iew so ha%ing e1actl! the same scale for eachimage is crucial.

). Setting transparenc* o( the background imageDescription Action

Background images with largewhite areas- as is often thecase with a linesplan- can be"ery dominant. #ou can a"oidthis by assigning a transparent

color. &reas with thetransparent color will not bedrawn on your screen. n caseof a black and white linesplanonly the black lines will remain"isible.

Select !a"#ground image =>,ransparent "olorfrom the pop'upmenu. $lick on a spot of !ourbackground image with the color !ouwant remo%ed. The background image

will now be redrawn in transparentmode.

&f !ou find the image still too dominanttr! blending it with the background.Use the !a"#ground image =>!lendingoption from the pop'upmenu and mo%e the slide bar until!ou(re satisfied.

Note:ou can remo%e transparenc! again b! repeating this process.&nstead of clicking on a spot within the background image simpl! selecta point outside the image.

+. Ad,usting the transparenc* tolerance

Description ActionEspecially when usingcompressed images like 0pegareas that appear white canconsist out of many shades ofwhite. n that case if thetransparent color has been setto white a lot of 1nearly white2noise remains "isible. Byincreasing the tolerance youcan remo"e that noise.

Select !a"#ground image =>,oleran"efrom the pop'up menu.E1periment a bit with the %alue until!ou(re satisfied with the appearance ofthe background image. For most #pegimages a tolerance of 34 works fine.The higher the compression rate of thefile5 the higher the tolerance needs tobe.

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-. #mporting more imagesDescription

epeat this process for thebodyplan and plan "iew of your

model.

. Assigning control cur&esDescription Action

4ow we!re going to assign acontrol cur"e to the deckline.This control cur"e is going tobe used at a later stage to5

6+ 'atch the shape ofthe deckline of thebackground images

)+ Fair the deckline insuch a way that weend up with a "erysmooth cur"e.

Select all of the edges from thedeckline *see also step 6.

From the main menu select Edit =>Cur-e => New.

" blue cur%e is now %isible. &t is better%isible if !ou hide the control net. oucan do this b! selecting ispla/ =>Control netfrom the main menu. &f thecur%e is still not %isible select ispla/=> Control "ur-esto turn of thedispla! of the control cur%es.

7epeat this to add a control cur%e tothe chine we(%e created in step 6.

"dd a control cur%e to the contourline.Select all edges on the centerplane ofthe ship5 including the edges of thebow.

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1/. Adding the other control cur&esDescription

f you!"e added all threecontrol cur"es your model

should look something like this.

11. Shaping the decklineDescription Action

The first thing we!re going todo is to try to match ourdeckline to that of thebackground image.

Turn of the control net *see step 8.

$hoose the plan %iew and select thedeckline. 2nce the deckline is selectedthe controlpoints and edges used forthis cur%e will be shown together withthe cur%ature plot *the purple lines. &fthe cur%ature plot is not %isible thereare two possibilities9

: The displa! of cur%atureplots is disabled. $heck *orenable it b! selectingispla/ => Cur-aturefromthe mainmenu.

6 The scale of the cur%atureplot is too small to be seen.ou can increase ordecrease the scale b!

pressing F:- or F8.

'odifying the shape is done byselecting a controlpoint of thecur"e and dragging it toanother location.

;o%e the controlpoints with the mouseto their new locations. Start with thestartpoint and endpoint. Then mo%ethe interior points of the cur%e. &f thedeckline is roughl! similar to that of thebackground image check !ourcur%ature plot. ;ake sure thecur%ature changes graduall! along thecur%e. &f not then ad#ust thecontrolpoints nearest to the cur%ature

peaks or %alle!s. Tr! to distribute the

points e%enl! along the cur%e

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IllustrationIllustration )): e"#line modified to mat"h the 0a"#ground image.: e"#line modified to mat"h the 0a"#ground image.

IllustrationIllustration ++: e"#line 0efore.: e"#line 0efore.


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1. Shape the chine and pro(ileDescription Action

This process should berepeated for the chine and also

for the profile of the hull.

1". Adapting the incremental distance

Description Action4ow our hull looks the same inthe plan "iew as the originallinesplan. The profile howe"erstill differs. 4ow we can switchto the profile "iew and mo"ethe points again with themouse. By doing so you runthe risk of accidentally shiftingthe points in longitudinaldirection- undoing our preciouswork of the pre"ious step.

;odif! the at thebottom of the main program windowthere(s a panel sa!ing


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1'. Use the shaded &iewDescription Action

$ongratulations: The mainfeature lines of the hull are

finished and the boat shouldlook "ery similar to the one ofthe linesplan. 4ow we!re goingto "isuali;e the surface of thehull in 3D.

Select ode => &hadefrom the pop'up menu in the perspecti%e %iew. The

hull surface will be shaded using%irtual lights. )arts of the hull that aresubmerged are shaded in gre! whilstthe rest of the hull is shaded green.ou can rotate the model b! keepingthe middle mouse button *ormousewheel pressed while mo%ingthe mouse. &f !ou ha%e no middlemouse button !ou can use thescrollbars at the bottom and to theright of the perspecti%e %iew.

1). Adding a new (aceDescription Action

/ur boat has no transom yet.e!re going to add a new facemanually to fill in the transom.

Switch to perspecti%e %iew.

Select the points shown on illustrationA. Start with the point on thecenterplane5 then the point on thechine and finall! the point on thedeckline. &f !ou need to select morethan one point !ou need to keep the$T7L'ke! on !our ke!board pressed.

Select Edit => Fa"e => Newfrom themainmenu to add the new face.

our model will look now like the oneshown on illustrationB.

Edge => &plitfrom themainmenu. "ll selected edges are splitin two and the new points areautomaticall! selected. &f !ou ha%eselected the edges in chronologicalorder then the new points are selectedin the same order. That will becon%enient for the ne1t step.

+. !onnect the new points with edges.Description Action

The new points need to beconnected with edges tomaintain a regular network. &llfaces should consist of 7 pointswhene"er possible and e"ery

point in the interior of thesurface should be connected to7 faces and four edges. This iscrucial if you want a goodfaired surface.

Select Edit => Edge => Insertfromthe mainmenu. &f !ou(%e selected theedges in the correct order in step 64then all the points will be connected toeach other with new edges as shown

to the right. &f the new edges do notrun continuousl! from the transom tothe stem *there(s a gap then simpl!select the two endpoints and repeatthe process.

7emember that in order to insert anew edge between two selected pointsthe points must share the same face

6)


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-. Ad,ust the shape o( the side panel.Description Action

ith the new points insertedwe can start ad0usting the

shape of the side panel.

Switch back to the bod!plan %iew.

;ake sure the control net is %isible.

$arefull! mo%e the new points a littleoutwards until the shape of thestations is the same as the originalstations. The bow needs noad#ustment so the displacement of the

points should graduall! reduce to Herowhile !ou work !our wa! to the front.

This is an iterati%e process5 so keepad#usting the control points until !ou(resatisfied with the shape of the stations.

. !reating a cur&ed transom.Description Action

The transom of our new hull isstill flat. The original transomshows a radius in the plan"iew. To ad0ust the shape ofthe transom we need to insertsome points and edges again.

Select the three horiHontal edges fromthe transom.

&nsert new points on these edges. &f!our not sure how to do this then ha%ea look at step 6>.

$onnect the new points b! insertingnew edges *see step 6A.

our transom should look now like theone displa!ed to the right.

"/. %odi(*ing the shape o( the transomDescription Action

To ad0ust the shape of thetransom the new points need tobe shifted.

o to the plan %iew. Shift the newpoints so that the top and bottomedges of the transom coincide with theones of the background image

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"1. %aking sure that transom is perpendicular to the centerplaneDescription Action

&lthough the transom may lookright it!s not completely finished

yet. e ha"e to make sure thatwhere the transom ends at thecenterplane it is perpendicularto the centerplane. /therwise itwould like there!s a knuckle linerunning "ertically o"er themiddle of the transom

Select the top edge of the transom*the one nearest to the centerplane.

;ake sure that the startpoint endendpoint ha%e e1actl! the same /'coordinate. &f not5 them ad#ust one ofthem manuall!.

Do the same for the middle and loweredge as shown to the right.

&f the shape of the transom haschanged significantl! it might benecessar! to repeat step 3- and 3:until the shape is satisfactor!.

That's it!

#ou!"e now successfully recreated a linesplan. f e"erything has been done correctly you should ha"e endedup with a boat that should be "ery similar to the one shown below.

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delftship tutorial01[1][1]

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