DEMOSCENEDEMOS ★ Shadows Demo ★

Odiesoft - Shadows DemoDemoscene Demos
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This was another attempt at creating a natural phenomena on my CPC! The scrolltext in this demo throws a shadow on the ground before it. This shadow is the mirrored text in a pre-calculated parallax scrolling. Unfortunately this demo overexert the power of the small CPC and thus this demo just runs with 25 frames/ second.

The calculation for this shadow was rather simple. Since I already had done a lot with vector graphics I just used my routines for rotating and transforming 3d-coordinates into 2d coordinates for the two dimensional screen to pre-calculate the zoom factor for the individual screen lines of the mirrored text.

I actually created a program that wrote the code for these screen lines automatically. The only thing I had to do after the code was written, was to clear it up a little. Replace LD BC,&0001 by LD C,&01 (when the B register was already zero) to increase the speed a little.

The background picture was a scan of a photo my dad took of a mountain close by. I scanned it using a hand scanner and converted it to the CPC with a program I wrote on my Acorn Archimedes. I've transferred the picture to the CPC using a RS232 link to the Archimedes.

For some reason I cannot fathom anymore I chose those weird colors for the shadow text. Probably I used those colors, because the background was already black and thus I couldn't use this typical shadow color anymore...

This demo was released as a part of the Divine Megademo. It also includes a cheat part (like all of my part in the Divine Demo). To activate it you have to press the keys "J", "U", "M" and "P" at the same time.

ODIESOFT

★ GROUPE: HJT
★ YEAR: 1993
★ EFFET(S): SCROLL TEXT , BIG SCROLL
★ CRTC: ???
★ CONFIG: ???
★ AUTEUR: ODIESOFT

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» Odiesoft-Shadows  DemoDATE: 2013-08-30
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L'Amstrad CPC est une machine 8 bits à base d'un Z80 à 4MHz. Le premier de la gamme fut le CPC 464 en 1984, équipé d'un lecteur de cassettes intégré il se plaçait en concurrent  du Commodore C64 beaucoup plus compliqué à utiliser et plus cher. Ce fut un réel succès et sorti cette même années le CPC 664 équipé d'un lecteur de disquettes trois pouces intégré. Sa vie fut de courte durée puisqu'en 1985 il fut remplacé par le CPC 6128 qui était plus compact, plus soigné et surtout qui avait 128Ko de RAM au lieu de 64Ko.