Thanks again.
Yes, I wondered why you were taking sextuples with
0 1 2 2 1 3 { coords .
So are you or some other genius in interfacing data,
displays and o/s developing some neat cover-functions?
I can't imagine I'd ever discover how to do what looks
like pretty low-level coding and high-level awareness
of all the tools available.
Brilliant stuff, Bill
Mike
On 28/06/2015 11:58, bill lam wrote:
the vertexData code was originally adapted from some C program.
ColorData can be calculated for arbitrary colors by some pseudo
code such as
(ABCDEFGH i. vertexData) { (8 colors for AB...GH)
Codes are much longer than that in J602 partly because users now
are responsible of feeding data into pipeline.
Also the shader demo is intended to also run on android, so that
each face (square) is represented as 2 triangles.
Вс, 28 июн 2015, Mike Day написал(а):
Marvellous!
I went back to J803 to compare, but the shader doesn't seem to
work there. However, the opengl/basic/colors demo in J602 is
very similar, requiring, apparently, very little code.
What a lot of code for the J804 version, but I suppose it's doing
a lot more than we mere mortals with viewmat - which in its turn
appears to do a whole lot more than what I'd realised hitherto...
I don't see why the definition of vertexData needs be quite so
long-winded. I'd define (perhaps)
'G H F E' =: - 'A B C D' =: _1 1 _1, 1 1 _1, 1 _1 _1,: _1 _1 _1
(not sure about the back-side - this labelling "sees"
a face EFGH behind the face ABCD)
and then define the 6 faces in terms of these labels.
Raul points out that the colours in the all-8-colours cube are
essentially the same as their vertices, so you could just define
colorData =: 1 fc _1 1 i. _1 fc vertexData
However, this assumes a fixed choice of colour for each vertex.
As it is, I don't see how one can easily modify the corner colours
to a user's arbitrary selection; this would be more manageable if
colorData were defined in terms of the 8 (arbitrary) colours
for A B .. G H. fc appears to support reals, so such colours
may be defined in [0.0, 1.0] if the user wishes.
Thanks,
Mike
On 28/06/2015 02:52, bill lam wrote:
I made an attemp to implement color scheme proposed by Raul and Mike
in the opengl shader demo of j804 beta. Please update qt addon
to check if the result agrees with viewmat, and fix shader if
necessary. F10 is used to start/stop timer.
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