Bill_Mass Posted May 22, 2012 Share Posted May 22, 2012 How does the Intellivision version of Frogger appear to have more than 8 moving objects at a time? I noticed the vehicles in the road don't move very smoothly. Does this mean they are part of the background? Same with the things in the river. Quote Link to comment Share on other sites More sharing options...
+cmart604 Posted May 22, 2012 Share Posted May 22, 2012 Joe? Carl? Mark? James? Thoughts? Quote Link to comment Share on other sites More sharing options...
BillyHW Posted May 22, 2012 Share Posted May 22, 2012 I just want to say that Intellivision Froggers is my favourite version. Quote Link to comment Share on other sites More sharing options...
catsfolly Posted May 22, 2012 Share Posted May 22, 2012 How does the Intellivision version of Frogger appear to have more than 8 moving objects at a time? I noticed the vehicles in the road don't move very smoothly. Does this mean they are part of the background? Same with the things in the river. You're exactly right. The cars and the logs are part of the background. The Intellivision background is made up of characters (cards). Some of these are predefined, like the alphabet, but other can be defined by the programmer. The program can use some of the custom characters to create an animation sequence. It is easiest to do this if the objects only move horizontally or vertically, which is great for frogger. As an example, here is an animation sequence for a tank moving left to right: gfx_row "........" "........" gfx_row "..####.." "........" gfx_row "........" "........" gfx_row "...##..." "........" gfx_row "...###.." "........" gfx_row "...##..." "........" gfx_row "........" "........" gfx_row "..####.." "........" gfx_row "........" "........" gfx_row "....####" "........" gfx_row "........" "........" gfx_row ".....##." "........" gfx_row ".....###" "........" gfx_row ".....##." "........" gfx_row "........" "........" gfx_row "....####" "........" gfx_row "........" "........" gfx_row "......##" "##......" gfx_row "........" "........" gfx_row ".......#" "#......." gfx_row ".......#" "##......" gfx_row ".......#" "#......." gfx_row "........" "........" gfx_row "......##" "##......" gfx_row "........" "........" gfx_row "........" "####...." gfx_row "........" "........" gfx_row "........" ".##....." gfx_row "........" ".###...." gfx_row "........" ".##....." gfx_row "........" "........" gfx_row "........" "####...." This technique is also used in worm womper, to make tons of worms for the player to shoot. Catsfolly 1 Quote Link to comment Share on other sites More sharing options...
intvnut Posted May 22, 2012 Share Posted May 22, 2012 I came here to say what Catsfolly did, more or less. Space Patrol also uses a variation of this technique to get the parallax effect. Quote Link to comment Share on other sites More sharing options...
intvnut Posted May 22, 2012 Share Posted May 22, 2012 BTW, the cheese "geese" demo I wrote some years back also demonstrates this approach. geese.asm Quote Link to comment Share on other sites More sharing options...
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