# Multi resolution support: Using HD resources on normal definition screen without beaking positions/physics

Multi resolution support: Using HD resources on normal definition screen without beaking positions/physics
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#1

Hello,

My question is about handling HD resources on standard definition devices without breaking positioning / physics. Thanks in advance for your time!

From a previous CC2D-iOS project, I’ve understood that:
iPhone (non-retina) :

• Screen height is 320px
• Use Normal textures > Character height is 100px
• Set scale factor to 1.0 so that the characters occupies */- 33 of screen height
• 1pt = 1 square px

Retina iPhone:

• Screen height is 640px
• Use HD textures > Character height is 200px
• Set scale factor to 2.0 so that the characters occupies +/- 33 of screen height
• 1pt = 2 square px
Result in both cases:
• Set character 1 at 0,0
• Set character 2 at 0, 100
• Both characters touch but don’t overlap
Aside from migrating to CC2D-x/HTML5 The purpose is now to run the game on iPad . Following the same logic, I do the following :
• Screen height is 768px
• Use Normal textures > Character height is 100px
• Set scale factor to 1.0 > character occupies*/- 13 of screen height
• 1pt = 1 square px

The character is too small, it should at least cover 20-25 of the screen height.

Attempt 1: Use HD textures and scale factor 1.0

• Character is larger (200 px) and occupies 26% of screen height, which is good.
• Positioning is broken: Set positions must be doubled, positions that I get must be halved before any processing happens.
• Physics is broken to: Mass is calculated based on the surface, must use a different pixel to meters ratio.

Result of attempt 1:

• Set character 1 at 0,0
• Set character 2 at 0, 100
• Both characters overlap (half of their surface does)

I’m looking the good way to handle this. Injecting scale factors based on device resolution in game logic doesn’t sound a clean solution.

• What is the usual way to deal with this?
• Is it possible to programmatically say “1pt = 2square px” so that coordinates system & physics are not broken?

Thanks!