NP CAD Page | Articles || Introduction | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 10 | 11 | 12 || Russian

Now it's time to rell about 95th dotted pair in ACAD_EVALUATION_GRAPH and Lookup parameter where there is a link opening doors into never seen dynamism.

First of all what is Lookup? Lookup is such a parameter that controls all the rest parameters. Suppose that you need simultaneously to move eyes and to remove nose. Hence it is necessary to make a parameter for moving eyes and Visibility parameter for managing nose visibility.

This can be made in three steps. First state: nose yes, eyes look up.
Second state: eyes look straight, nose yet yes.
Third state: eyes came to nose, nose disappeared.
Lookup is a table where in the first column you choose parameter moving the first eye. In the second column there is a parameter to move second eye and the third one there is a Visibility parameter switching representations. In the column to the right we put parameters naming states: "look up", "look straight", "look to the nose".

If we select block then in the empty zone a cyan triangle appears. If we click it a popup menu with three items ("look up", "look straight", "look to the nose") opens. Click at any state and Lookup transforms all the parameters to required mode.
And this was till the moment when I decided to pick this Lookup.

A little digression. The fact is sorcerers from Autodesk blocked possibility to set mre than one activator to Lookup parameter. And table is such an activator.

How activator is linked with parameter? It turns out that only by one dotted pair. Let's add Lookup to our block and try to see its links. (I killed Visibility Set - it is unneeded).

((-1 . <Entity name: 7efdd248>)
(0 . "ACAD_EVALUATION_GRAPH")
(5 . "149")
(102 . "{ACAD_REACTORS") (330 . <Entity name: 7efdd240>) (102 . "}")
(330 . <Entity name: 7efdd240>)
(100 . "AcDbEvalGraph")
(96 . 9)
(97 . 9)
(91 . 0) (93 . 32) (95 . 5) (360 . <Entity name: 7efdd288>) (92 . 0) (92 . 3) (92 . 1) (92 . 2)
(91 . 1) (93 . 32) (95 . 6) (360 . <Entity name: 7efdd290>) (92 . -1) (92 . -1) (92 . 0) (92 . 0)
(91 . 2) (93 . 32) (95 . 7) (360 . <Entity name: 7efdd298>) (92 . 1) (92 . 1) (92 . -1) (92 . -1)
(91 . 3) (93 . 32) (95 . 8) (360 . <Entity name: 7efdd2a0>) (92 . 2) (92 . 2) (92 . -1) (92 . -1)
(91 . 4) (93 . 32) (95 . 9) (360 . <Entity name: 7efdd2b8>) (92 . -1) (92 . -1) (92 . 3) (92 . 3)
(92 . 0) (93 . 0) (94 . 1) (91 . 1) (91 . 0) (92 . -1) (92 . 3) (92 . -1) (92 . -1) (92 . -1)
(92 . 1) (93 . 0) (94 . 1) (91 . 0) (91 . 2) (92 . -1) (92 . -1) (92 . -1) (92 . 2) (92 . -1)
(92 . 2) (93 . 0) (94 . 1) (91 . 0) (91 . 3) (92 . -1) (92 . -1) (92 . 1) (92 . -1) (92 . -1)
(92 . 3) (93 . 0) (94 . 1) (91 . 4) (91 . 0) (92 . 0) (92 . -1) (92 . -1) (92 . -1) (92 . -1))

<Entity name: 7efdd288> is Lookup parameter.
<Entity name: 7efdd290> is its grip.
<Entity name: 7efdd298> is X position.
<Entity name: 7efdd2a0> is Y position.
<Entity name: 7efdd2b8> is activator.

We open activator:
(entget (cdr (assoc 360 (reverse EVAL_GRAPH))))

((-1 . <Entity name: 7efdd2b8>)
(0 . "BLOCKLOOKUPACTION")
(330 . <Entity name: 7efdd248>)
(5 . "157")
(100 . "AcDbEvalExpr")
(90 . 9)
(98 . 27)
(99 . 1)
(100 . "AcDbBlockElement")
(300 . "Lookup1")
(98 . 27)
(99 . 1)
(1071 . 8)
(100 . "AcDbBlockAction")
(70 . 0)
(71 . 0)
(1010 471.79 -132.523 0.0)
(100 . "AcDbBlockLookupAction")
(92 . 0)
(93 . 1)
(301 . "")
(303 . "")
(94 . 5)
(95 . 1)
(96 . 0)
(282 . 1)
(305 . "Custom")
(281 . 0)
(304 . "lookupString")
(280 . 1))

Pay attention to pair 94 in the activator. It always points to 95th pair value in that parameter record of ACAD_EVALUATION_GRAPH to which activator is linked. If you change this pair in the activator to another pair pointing to other parameter then cativatot will work for it.

Now I described movement of the first eye by table in one activator, movement of the other eye in another activaator and nose visibility in the third one. All of them are connected to one parameter and I am not obliged to select statue states from the list. I take the eye and pull. Firstly both eyes go to the middle part, after that they go down and nose disappears.

Previous | Next

NP CAD Page | Articles || Introduction | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 10 | 11 | 12 || Russian