[Radiance-general] practical question about radiance

[Jack de Valpine]

Hi Imene,

There are several way to accomplish this. If we assume that you have a 
separate file for your chair object called "simple_chair.rad" with its 
origin at the lowest point midway between the front legs and facing 
along positive X (for example), here are a few ways to place the chair 
or multiple copies of the chair in your scene.

In a new file called "scene_chairs.rad" you could use  xform as follows:

    !xform -rz 90 -t 10 0 0 simple_chair.rad
    !xform -rz 270 -t 10 5 0 simple_chair.rad

This should place two chairs (simple_chair.rad) 5 units apart from each 
other in Y located 10 units from the origin in X.

However if you are going to do lots of repeated instances of the chair, 
it would be better to use real octree instances as these will save on 
memory. To do this you need to do the following:

Step 1: compile the chair object into a frozen octree - assumes that the 
materials are in a separate file

        oconv -f mats.simple_chair.rad simple_chair.rad > simple_chair.oct

        NOTE that this creates what is known as a "frozen" octree which
        basically means that the materials and geometry are all compiled
        together and changes to any of the base rad files will NOT
        effect the octree....

Step 2: create a file called - "simple_chair.instance.rad" and input the 
following

        void instance my_simple_chair_instance
        7 simple_chair.oct -s 1.0 -t 0.0 0.0 0.0
        0
        0

Step 3: place your chair object (for example in scene_chairs.rad):

    !xform -rz 90 -t 10 0 0 -a 20 -t 2.5 0 0 simple_chair.instance.rad
    !xform -rz 270 -t 10 5 0 -a 20 -t 2.5 0 0 simple_chair.instance.rad

assuming that I did this correctly this would create 2 rows (offset by 
10 units in X from the origin) of 20 chairs each facing each other at a 
distance of 5 units in Y.

I hope this helps.

-Jack

-- 
# Jack de Valpine
# president
#
# visarc incorporated
# http://www.visarc.com
#
# channeling technology for superior design and construction

On 7/16/2012 10:15 AM, imenslama at voila.fr wrote:
> Hi community,
> when we create an object in radiance software, for example : simple chair. How can we put it in the room in a specific location? I know, you will tell me that xform is a command that allows this funtion. The problems is that i used xform for the design of the chair itself and it's a bit difficult to use it again to move each element of the chair in the desired location. Is there a command in radiance to create a block called chair ?It will be easy after this to use xform to move the bloc chair in the desired location.
> Thank you
> Imène
>
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