topic Re: perspective drawings hatch pattern stretching? in AutoCAD Forum

perspective drawings hatch pattern stretching?

Anonymous — Tue, 28 Nov 2017 22:20:38 GMT

Is there a way finally? I use ACAD for commercial and residential perspective renderings. stretching a hatch to different lengths and shapes is not an issue. but with the advancement of ACAD are you still not able to stretch a hatch pattern in a perspective such as lines or brick?

Re: perspective drawings hatch pattern stretching?

Anonymous — Tue, 28 Nov 2017 22:33:29 GMT

Considering the way hatch patterns are defined in 2D space, probably not. However a regular hatch pattern in a 3D model will provide exactly what you're looking for.

If you do a lot of rendering you should look into 3D StudioMax

Re: perspective drawings hatch pattern stretching?

Alfred.NESWADBA — Tue, 28 Nov 2017 22:35:03 GMT

Hi,

>> Is there a way finally? I use ACAD for commercial and residential perspective renderings.

I don't see any problem, draw a box, hatch the sides of the box and change the display mode to perspective ...

>> stretching a hatch to different lengths

Can you please describe what you are missing? I don't need to stretch anything to get the hatch and to make the view perspective?

- alfred -

Re: perspective drawings hatch pattern stretching?

Anonymous — Wed, 29 Nov 2017 16:40:29 GMT

I think he's drawing in 2D not 3D.

Re: perspective drawings hatch pattern stretching?

Alfred.NESWADBA — Wed, 29 Nov 2017 19:21:01 GMT

Hi @Anonymous

>> I think he's drawing in 2D not 3D.

Well, the headline says "perspective drawings ..." ... if perspective objects are drawn in 2D then I guess that is not a job for a CAD-system, is it?

But let's wait for the answer.

- alfred -

Re: perspective drawings hatch pattern stretching?

Anonymous — Wed, 29 Nov 2017 19:58:44 GMT

I am creating these in 2D not 3D. in this case below main corner (right gable end) 100% scale, end of right/left sides 70% scale.

Re: perspective drawings hatch pattern stretching?

Anonymous — Wed, 29 Nov 2017 20:00:17 GMT

this is a 2D perspective. which is the issue I believe.

Re: perspective drawings hatch pattern stretching?

Alfred.NESWADBA — Wed, 29 Nov 2017 20:25:56 GMT

Hi,

>> I am creating these in 2D not 3D

Well, I guess you are using a tool in a way it is not designed for and it is not efficient.

How long do you need to define the perspective points (sorry not to know the correct words in English), then draw a lot of lines to these 2 points and then trim them to the vertical borders? Just imagine how long you will have to work if one of these objects have to be moved?

You do have a 3D system, just use it ...

- alfred -

Re: perspective drawings hatch pattern stretching?

Anonymous — Wed, 29 Nov 2017 20:46:44 GMT

-Alfred- that is normally how I do it. line work is simple but creating brick veneer to display this way is the difficult part. I do everything in 2D and there lies the problem. guess I need to take the time to venture out more to 3D to resolve this issue. Thanks.

Re: perspective drawings hatch pattern stretching?

Anonymous — Wed, 29 Nov 2017 21:21:17 GMT

Okay, that image is not a true perspective unless your end gables are shaped funny. The only component that appears to approach a vanishing point is the front walk.

Having had to do these kinds of drawings prior to the advent of CAD, true perspectives in 2D are a royal pain in the nether regions, made only slightly better by CAD. 3D perspectives require more modeling but the results are not just more accurate, but the applications of materials can make the end product considerably more spectacular.

Re: perspective drawings hatch pattern stretching?

pendean — Wed, 29 Nov 2017 21:42:47 GMT

Your drafting in CAD like you drafted in paper: that's the problem, AutoCAD doesn't work like that very well especially with 2D flat hatching.

Hatches are defined in very narrow parameters in AutoCAD, there is no allowance for "scrunching" on one side like you've drawn.

You'll have to get into 3D modelling: it's probably a lot easier if you use AutoCAD Architecture or REVIT instead of plain AutoCAD as most of the elements will be drawn correctly in elevation as models to start with.

Re: perspective drawings hatch pattern stretching?

SEANT61 — Wed, 29 Nov 2017 22:14:58 GMT

Does it have to be a hatch? There are several add-in programs available that will convert an ortho view to perspective via projection from one rectangular reference to another. They tend to work with just standard line/curve geometry, i.e., the hatches need to be EXPLODEd.

Re: perspective drawings hatch pattern stretching?

Anonymous — Wed, 29 Nov 2017 22:30:03 GMT

-rculp-

No that is not a perspective, just a flat shot with gradient fill. but is typical of what I do instead of true perspectives in some cases to give a client a better visual rather than a black line drawing. I agree, perspectives are much more difficult in 2D. must venture out more. but thanks for the input everyone.