# Grid size

(Abavagada) #1

When I am modelling, I would like to have a set scale between blender units and reality. However, I am not sure this is possible.

For example, I usually assume the single square to be 5 feet. But each time I try to calculate he proportions, by creating a square that matches the grid square and checking it’s size using N, I seem to get a fluctuating number. Is there a way to calculate a stable scale?

(ookami77) #2

I’m not sure if you can do what you want in Blender, but I’ve found that using AutoCAD to create my templates is a good way to ensure I have the correct proportions. First I create a top, side and front view of the object in AutoCAD and then export it as a DXF. I then import it into Blender and adjust the DXF drawings so I can use them while creating the Blender object. It’s a bit of a pain, but since I don’t know how to do what you are trying to do in Blender I have to use this method. Hope this helps… sorry if it’s useless.

(SirDude) #3

Are you using the snap tool to snap the thing to the grid when
you get those goofy values?

(Abavagada) #4

Well, if I, say, create a cube, and make it the size of a square unit, I then check it’s size, using N. From the numbers in the x,y, and z, I can do some simple equations to get the ratio. However, it seems that each time I do this, I get different numbers. Why?

(MoreK) #5

You can snap to grid, did you know that:

1. Create a cube
2. Press S (to resize)
3. Move your mouse while HOLDING CONTROL KEY in the keyboard

Now, you should get an exact size for your cube.

(Abavagada) #6

I know that. I do that

But check the size of the cube, using N.
What value do you get?

I used that number to calcualte a ratio to 5, and use that to size other objects. However, I find that sometimes the meshes have a variable size, sometimes just 1. Seems like Blender keeps changing the size of the units.

(MoreK) #7

[quote=“Abavagada”]I know that. I do that

But check the size of the cube, using N.
What value do you get?quote]

Hmmm… With a cube I get even values (e.g. 2.00, 2.00, 2.00). I’ve got take another look later.

(d52477001) #8

hmm… i don’t really understand what you are saying.

objects all have a different size if x,y and z are on. eg. a plane of this size is smaller than a sphere of this size. Also when you resize something and look at the bottom left, this is not the total size.

eg. you have a plane and increase the size by two (according to the info at the bottom left of the window). if you then take the plane again and increase the sixe by 1.5 then the total size of the object is 3 (2x1.5). check this by pressing ‘n’.

d52477001