Problem to create a roof that is not a plane

timoxy · 25 Apr 2020, 17:27

Hi everybody,

I search to change my business to work with sketchup. I know sketchup (i work on it since 5 weeks, thanks the confinement).

I try to make an old house to renovate it.

Problem, the roof is not plane and not right. The gables of the house are not parallel.

So i make something but i'm not satisfy is not good. What is your tip to make this project ?

You can find my SKP in download.

I tried to make this with fredo6 jointpushpull and curviloft but is not work perfectly....

My angles are not good, my roof don't touch my wall ... I don't understand how to make this ...

Thanks in advance for your help !

test maison.skp

pbacot · 25 Apr 2020, 20:55

No need for Curviloft IMO if you don't have actual curves along the edges. You have straight edges at the tops of the walls, that's OK. The softened triangular shapes are fine.

I can see how you might fix the walls and roof by raising the walls,and intersecting to the roof shapes, but it could be difficult for you to do.

You've done some good work, so it's hard to say start over. Next time save the tile, trim, and gutters for later and make the edges of the basic structure match up, basing the roof shape on the top of wall. Good to keep separate components of parts as you have done.

L i am · 26 Apr 2020, 01:10

If you use sandbox "from contours" would do it I think. So I would suggest making the roof a wireframe and fill the roof "planes" from contours. will be unforgiving but do-able

pbacot · 26 Apr 2020, 02:47

I redrew the basic roof shapes based on the outside wall edges.using joint push pull and trimmed the one gable to fit to the roof, by using intersect with model, removing the edges that stuck into the roof and adding the short line toward the bottom of the gable. This is just the basics as I don't know what sort of construction you are doing.

test maison 2.skp

timoxy · 26 Apr 2020, 13:26

@pbacot said:

No need for Curviloft IMO if you don't have actual curves along the edges. You have straight edges at the tops of the walls, that's OK. The softened triangular shapes are fine.

I can see how you might fix the walls and roof by raising the walls,and intersecting to the roof shapes, but it could be difficult for you to do.

You've done some good work, so it's hard to say start over. Next time save the tile, trim, and gutters for later and make the edges of the basic structure match up, basing the roof shape on the top of wall. Good to keep separate components of parts as you have done.

Hi Pbacot, thanks for your advice, but i think for a professionnal is not suffisant because is not perfect. This house is very complicate beacuse nothing is right (floor, wall, roof, nothing !) I take this exemple because this is my parents' house they are renovating so no pressure if i made mistake. but for futur customer i need to make a perfect job !

@pbacot said:

I redrew the basic roof shapes based on the outside wall edges.using joint push pull and trimmed the one gable to fit to the roof, by using intersect with model, removing the edges that stuck into the roof and adding the short line toward the bottom of the gable. This is just the basics as I don't know what sort of construction you are doing.

Your work it's much better with this gable, no hole, no empty zone, but i don't really understood your process to make this. So i made little video to show you my process :
https://youtu.be/vRzOB7soMOU

It's like this ?

Thanks again Pbacot

pbacot · 26 Apr 2020, 22:40

Yes, Timoxy

This is the same in concept, but I only modified your wall and redrew the roof. I ended up with a roof that is warped like you had before--so all faces were made of 2 triangles. The way you just did it on the video looks like the ridge is parallel to the low walls, front and "jardin". There fore you you can create a face that is actually all one plane?

The roof surfaces determine if the top of the wall needs to be reshaped--because push pull just creates faces perpendicular to the original face (in this case the gable wall face), and that creates a top of wall that is not properly aligned to the roof plane. It may be helpful to use push pull to give you the wall thickness but in this case the top needs to be trimmed afterwards.

Also notice that some of the "jardin" roof sticks out over the gable after your push-pull it up. Here again you may want to create an edge on the top surface to align with the face of the wall below, and trim that top shape as you did the wall. The side face of that roof slab will have to re-made of two triangles like you did for the top of the wall.

It may help to consider how the house is actually built. How do the walls support the roof? What occurs where different elements meet? When you draw the roof slab what does that represent? A deck made out of boards? I don't mean you have to draw every board, but consider what the slab is and where it fits in the structure. I bet the walls are stone and plaster, or concrete?

When we make models we can have them represent the outer appearance only, or just the approximation of the general form of the whole house. Or we can also model the beams and rafters etc. and specifically represent the structure. You may want to do that greater detail or not, but studying that can help decide how you want to make your model--what the faces represent and how they meet other faces. Going to the level of modeling structural elements could eventually help in planning the remodel work, if necessary.

As in the actual construction of the house, sometimes the big structural elements just don't meet up nicely, and these gaps are covered in tile or trim, or plastered-up in the end!

timoxy · 27 Apr 2020, 08:16

Thanks a lot pbacot, for the moment I don't know how the roof and the frame were built.

I effect the house is built with only bricks and sometimes few concrete. The builders took everything they had on hand and they didn't have enough quantity. There is absolutely nothing right ! But really no walls and roofs are straight. It's a very good exercise !

Actually i need to make good exterior construction with the walls, because i need to adapt a verenda with existing walls. For the moment i don't need to touch the roof. the roof does'nt need renovation.

I understand your process to built this type. You are right about the roof, it's better to draw all the wood, like this we can make exactly the same "operation". When i go to the house i'll take measure and picture to draw the roof at 100 % with the wood.

Thanks for your request and your help Pbacot ! If you want see the finish draw it's with pleasure !