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decode Z depth in pixel shader

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someone know the way for encode and decode z-depth value (for shadow-map)stored in color register or texture register in pixel shader,under 1_1 and 1_4?. I need high precison z-value for shadow -map. [edited by - jeppa on September 25, 2003 9:29:26 AM] [edited by - jeppa on September 25, 2003 11:41:40 AM]

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