Brecht

I'm looking for a way to correct a little error that is occurring in 

The movielink below is a registration of this installation, the error 

Look for : the little bar on top going away, leaving just the big 

panorama in the background visible. The scrolling goes smooth except 

on the right side, where one panel of the panorama flashes on top 

http://www.marnixdenijs.nl/downloads/Beijing_Accelerator_TENT_WEB.mov

Below is a part of the patch for this installation. The problem is 

this : I move 4 panels left>right or right>left containing part of 

the panorama. Once they are offscreen, they are moved to the other 

The way these panels move is regulated by the sensor in the rotating 

chair. Since this sensor detects a given number of concrete steps in 

the rotation, I interpolate the motion of the panels using a little 

abstraction I made called 'bounce' (also below).

Now, this 'bounce' abstraction uses the bline object, this all works 

well to move the panels normally, but when whey have to move to the 

other end after going offscreen, the bline object would move them 

from say point -100 to 100, going through every step in between and 

thus passing through the projected image. Since this is not desired, 

I detect when the pictures x-position is > than a certain nr. and if 

so, set the new position to bline "immediately".

I don't know where something exactly goes wrong, whether it is in the 

'immediate' setting of the new location or with the detection which 

opens the gate to send the location to 'immediate' or not. I just 

thought I'd post it.. perhaps someone has an "aaah that's why"- 

moment... since all those I had didn't solve it.

I'm afraid that this might all still be a bit vague but I can only 

I'm looking for a way to correct a little error that is occurring in  
an installation.
The movielink below is a registration of this installation, the error  
is visible about 3/4ths into the movie.
Look for : the little bar on top going away, leaving just the big  
panorama in the background visible. The scrolling goes smooth except  
for a little hickup
on the right side, where one panel of the panorama flashes on top  
before going away again.

Below is a part of the patch for this installation. The problem is  
this : I move 4 panels left>right or right>left containing part of  
the panorama. Once they are offscreen, they are moved to the other  
side to create endless scrolling.

The way these panels move is regulated by the sensor in the rotating  
chair. Since this sensor detects a given number of concrete steps in  
the rotation, I interpolate the motion of the panels using a little  
abstraction I made called 'bounce' (also below).
Now, this 'bounce' abstraction uses the bline object, this all works  
well to move the panels normally, but when whey have to move to the  
other end after going offscreen, the bline object would move them  
from say point -100 to 100, going through every step in between and  
thus passing through the projected image. Since this is not desired,  
I detect when the pictures x-position is > than a certain nr. and if  
so, set the new position to bline "immediately".

I don't know where something exactly goes wrong, whether it is in the  
'immediate' setting of the new location or with the detection which  
opens the gate to send the location to 'immediate' or not. I just  
thought I'd post it.. perhaps someone has an "aaah that's why"- 
moment... since all those I had didn't solve it.
I'm afraid that this might all still be a bit vague but I can only  
ask and cross my fingers :D

finetuning-problem-for-scrolling-panorama-installation

I havent seen the patches (did they bounce), but that looks really 

Im assuming you are using openGL for this (it looks quite smooth)? if 

the panels are set to automatic 0, maybe simply stop banging them 

until the bline has finished placing them?

On Sep 18, 2006, at 3:14 PM, Brecht Debackere wrote:

> I'm looking for a way to correct a little error that is occurring 

> The movielink below is a registration of this installation, the 

> error is visible about 3/4ths into the movie.

> Look for : the little bar on top going away, leaving just the big 

> panorama in the background visible. The scrolling goes smooth 

> on the right side, where one panel of the panorama flashes on top 

> Below is a part of the patch for this installation. The problem is 

> this : I move 4 panels left>right or right>left containing part of 

> the panorama. Once they are offscreen, they are moved to the other 

> The way these panels move is regulated by the sensor in the 

> rotating chair. Since this sensor detects a given number of 

> concrete steps in the rotation, I interpolate the motion of the 

> panels using a little abstraction I made called 'bounce' (also below).

> Now, this 'bounce' abstraction uses the bline object, this all 

> works well to move the panels normally, but when whey have to move 

> to the other end after going offscreen, the bline object would move 

> them from say point -100 to 100, going through every step in 

> between and thus passing through the projected image. Since this is 

> not desired, I detect when the pictures x-position is > than a 

> certain nr. and if so, set the new position to bline "immediately".

> I don't know where something exactly goes wrong, whether it is in 

> the 'immediate' setting of the new location or with the detection 

> which opens the gate to send the location to 'immediate' or not. I 

> just thought I'd post it.. perhaps someone has an "aaah that's why"- 

> moment... since all those I had didn't solve it.

> I'm afraid that this might all still be a bit vague but I can only 

I havent seen the patches (did they bounce), but that looks really  
nice. Id love to try it myself.

Im assuming you are using openGL for this (it looks quite smooth)? if  
the panels are set to automatic 0, maybe simply stop banging them  
until the bline has finished placing them?

> Hello all,
>
> I'm looking for a way to correct a little error that is occurring  
> in an installation.
> The movielink below is a registration of this installation, the  
> error is visible about 3/4ths into the movie.
> Look for : the little bar on top going away, leaving just the big  
> panorama in the background visible. The scrolling goes smooth  
> except for a little hickup
> on the right side, where one panel of the panorama flashes on top  
> before going away again.
>
> http://www.marnixdenijs.nl/downloads/Beijing_Accelerator_TENT_WEB.mov
>
> Below is a part of the patch for this installation. The problem is  
> this : I move 4 panels left>right or right>left containing part of  
> the panorama. Once they are offscreen, they are moved to the other  
> side to create endless scrolling.
>
> The way these panels move is regulated by the sensor in the  
> rotating chair. Since this sensor detects a given number of  
> concrete steps in the rotation, I interpolate the motion of the  
> panels using a little abstraction I made called 'bounce' (also below).
> Now, this 'bounce' abstraction uses the bline object, this all  
> works well to move the panels normally, but when whey have to move  
> to the other end after going offscreen, the bline object would move  
> them from say point -100 to 100, going through every step in  
> between and thus passing through the projected image. Since this is  
> not desired, I detect when the pictures x-position is > than a  
> certain nr. and if so, set the new position to bline "immediately".
>
> I don't know where something exactly goes wrong, whether it is in  
> the 'immediate' setting of the new location or with the detection  
> which opens the gate to send the location to 'immediate' or not. I  
> just thought I'd post it.. perhaps someone has an "aaah that's why"- 
> moment... since all those I had didn't solve it.
> I'm afraid that this might all still be a bit vague but I can only  
> ask and cross my fingers :D
>
> I've sent the patches in a new mail.
>
> Rgds,
> Brecht.
>

Yep. They bounced. I've put the text here : 

It is indeed open GL, current resolution of the photos is 1024x768, 

but 1600x1200 worked smoothly as well (I will send the specs of the 

PC on which it is running, otherwise "smooth" is a pretty vague 

notion :) ) . Your solution might just as well allready work 

though... it'd require some repatching, but it's a good way to do it.

I was thinking of using the layer possibilities in 1.6, but 

unfortunately it's running on PC so no such luck.

> I havent seen the patches (did they bounce), but that looks really 

> Im assuming you are using openGL for this (it looks quite smooth)? 

> if the panels are set to automatic 0, maybe simply stop banging 

> them until the bline has finished placing them?

> On Sep 18, 2006, at 3:14 PM, Brecht Debackere wrote:

>> I'm looking for a way to correct a little error that is occurring 

>> The movielink below is a registration of this installation, the 

>> error is visible about 3/4ths into the movie.

>> Look for : the little bar on top going away, leaving just the big 

>> panorama in the background visible. The scrolling goes smooth 

>> on the right side, where one panel of the panorama flashes on top 

>> Below is a part of the patch for this installation. The problem is 

>> this : I move 4 panels left>right or right>left containing part of 

>> the panorama. Once they are offscreen, they are moved to the other 

>> The way these panels move is regulated by the sensor in the 

>> rotating chair. Since this sensor detects a given number of 

>> concrete steps in the rotation, I interpolate the motion of the 

>> panels using a little abstraction I made called 'bounce' (also 

>> Now, this 'bounce' abstraction uses the bline object, this all 

>> works well to move the panels normally, but when whey have to move 

>> to the other end after going offscreen, the bline object would 

>> move them from say point -100 to 100, going through every step in 

>> between and thus passing through the projected image. Since this 

>> is not desired, I detect when the pictures x-position is > than a 

>> certain nr. and if so, set the new position to bline "immediately".

>> I don't know where something exactly goes wrong, whether it is in 

Yep. They bounced. I've put the text here : http:// 
www.visualantics.net/BA_accelerator.txt
It is indeed open GL, current resolution of the photos is 1024x768,  
but 1600x1200 worked smoothly as well (I will send the specs of the  
PC on which it is running, otherwise "smooth" is a pretty vague  
notion :) ) . Your solution might just as well allready work  
though... it'd require some repatching, but it's a good way to do it.
I was thinking of using the layer possibilities in 1.6, but  
unfortunately it's running on PC so no such luck.

> I havent seen the patches (did they bounce), but that looks really  
> nice. Id love to try it myself.
>
> Im assuming you are using openGL for this (it looks quite smooth)?  
> if the panels are set to automatic 0, maybe simply stop banging  
> them until the bline has finished placing them?
>
>
>
>
> v a d e //
>
> www.vade.info
> abstrakt.vade.info
>
> On Sep 18, 2006, at 3:14 PM, Brecht Debackere wrote:
>
>> Hello all,
>>
>> I'm looking for a way to correct a little error that is occurring  
>> in an installation.
>> The movielink below is a registration of this installation, the  
>> error is visible about 3/4ths into the movie.
>> Look for : the little bar on top going away, leaving just the big  
>> panorama in the background visible. The scrolling goes smooth  
>> except for a little hickup
>> on the right side, where one panel of the panorama flashes on top  
>> before going away again.
>>
>> http://www.marnixdenijs.nl/downloads/Beijing_Accelerator_TENT_WEB.mov
>>
>> Below is a part of the patch for this installation. The problem is  
>> this : I move 4 panels left>right or right>left containing part of  
>> the panorama. Once they are offscreen, they are moved to the other  
>> side to create endless scrolling.
>>
>> The way these panels move is regulated by the sensor in the  
>> rotating chair. Since this sensor detects a given number of  
>> concrete steps in the rotation, I interpolate the motion of the  
>> panels using a little abstraction I made called 'bounce' (also  
>> below).
>> Now, this 'bounce' abstraction uses the bline object, this all  
>> works well to move the panels normally, but when whey have to move  
>> to the other end after going offscreen, the bline object would  
>> move them from say point -100 to 100, going through every step in  
>> between and thus passing through the projected image. Since this  
>> is not desired, I detect when the pictures x-position is > than a  
>> certain nr. and if so, set the new position to bline "immediately".
>>
>> I don't know where something exactly goes wrong, whether it is in  
>> the 'immediate' setting of the new location or with the detection  
>> which opens the gate to send the location to 'immediate' or not. I  
>> just thought I'd post it.. perhaps someone has an "aaah that's  
>> why"-moment... since all those I had didn't solve it.
>> I'm afraid that this might all still be a bit vague but I can only  
>> ask and cross my fingers :D
>>
>> I've sent the patches in a new mail.
>>
>> Rgds,
>> Brecht.
>>
>

Finetuning problem for scrolling panorama installation