Animation improvement

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Julián Francisco
Julián Francisco am 25 Dez. 2011
I have written a code to create an animation: satellite movement around the Earth. When I run it, it works fine. However, when it is modified to be part of a code much more complex present in a Matlab GUI, the results produced changes (mainly because of the bigger number of points to plot). I also have noticed that if I use the OpenGL renderer the movement of the satellite is quicker than when the other renderers (Painters and Zbuffer) are used. I do not know if there are further possibilities to achieve an improvement in the rendering of the satellite movement. I think the key is, perhaps, changing the code that creates the actual position of the satellite ( handles.psat ) and its trajectory along the time ( handles.tray )
handles.tray = zeros(1,Fin);
handles.psat = line('parent',ah4,'XData',Y(1,1), 'YData',Y(1,2),...
'ZData',Y(1,3),'Marker','o', 'MarkerSize',10,'MarkerFaceColor','b');
...
while (k<Fin)
az = az + 0.01745329252;
set(hgrot,'Matrix',makehgtform('zrotate',az));
handles.tray(k) = line([Y(k-1,1) Y(k,1)],[Y(k-1,2) Y(k,2)],...
[Y(k-1,3) Y(k,3)],...
'Color','red','LineWidth',3);
set(handles.psat,'XData',Y(k,1),'YData',Y(k,2),'ZData',Y(k,3));
pause(0.02);
k = k + 1;
if (state == 1)
state = 0;
break;
end
end
...

Akzeptierte Antwort

Walter Roberson
Walter Roberson am 25 Dez. 2011
It might be faster to code the transform yourself as a matrix multiplication rather than calling makehgtform. The array is fairly simple: http://www.siggraph.org/education/materials/HyperGraph/modeling/mod_tran/3drota.htm
( cos q sin q 0 0)
Rz (q) = (-sin q cos q 0 0)
( 0 0 1 0)
( 0 0 0 1)
Only two trig calls needed.
  3 Kommentare
Walter Roberson
Walter Roberson am 26 Dez. 2011
Use the above matrix to multiply [X(:), Y(:), Z(:), ones(numel(X),1)]
Or just strip it down to an X-Y rotation as your Z is going to stay the same.
As you are using fixed angular steps (1 degree), you could pre-calculate all of the positions and then use simple indexing.
cq = cosd(0:359);
sq = sind(0:359);
Then (mumble... bsxfun... maybe matrix multiply... mumble) and you should be able to get out the complete point list at all angles of interest.
Sorry about the (mumble), but it is quarter to 5 in the morning here and I am fading a bit.
Julián Francisco
Julián Francisco am 26 Dez. 2011
@Walter Roberson: Thank you back. Excuse me for my lazy ignorance. I have just found the rotate function also can be used to rotate the sphere.

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