{"id":254,"date":"2015-01-08T13:09:36","date_gmt":"2015-01-08T06:09:36","guid":{"rendered":"https:\/\/toihocdohoa.com\/blog\/?p=254"},"modified":"2015-01-08T13:09:36","modified_gmt":"2015-01-08T06:09:36","slug":"ater-effect-expression-toan-tap-bai-1-gioi-thieu-va-thao-tac-co-ban","status":"publish","type":"post","link":"https:\/\/toihocdohoa.com\/blog\/ater-effect-expression-toan-tap-bai-1-gioi-thieu-va-thao-tac-co-ban\/","title":{"rendered":"[Ater effect] Expression to\u00e0n t\u1eadp – b\u00e0i 1: gi\u1edbi thi\u1ec7u v\u00e0 thao t\u00e1c c\u01a1 b\u1ea3n"},"content":{"rendered":"\n\n
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\n 4.7\/5 - (7 votes) <\/div>\n <\/div>\n

Gi\u1ea3 s\u1eed c\u00e1c b\u1ea1n \u0111\u00e3 bi\u1ebft\u00a0\u0111\u01b0\u1ee3c c\u00e1c c\u00f4ng c\u1ee5 c\u01a1 b\u1ea3n c\u1ee7a AE r\u1ed3i nh\u00e9. N\u1ebfu ch\u01b0a th\u00ec n\u00ean google t\u1eeb kh\u00f3a “h\u01b0\u1edbng d\u1eabn After Effect c\u01a1 b\u1ea3n”. Kh\u00f4ng th\u00ec c\u1ee9 \u0111\u1ecdc c\u0169ng ch\u1eb3ng sao, h\u01a1i kh\u00f3 ti\u00eau m\u1ed9t ch\u00fat th\u00f4i.<\/p>\n

I. Gi\u1edbi thi\u1ec7u Expression<\/h2>\n
\"wiggle\"
V\u00ed d\u1ee5: t\u1ea1o\u00a0Exp rung\u00a0wiggle(10,30)\u00a0cho thu\u1ed9c t\u00ednh Position c\u1ee7a 1 h\u00ecnh vu\u00f4ng th\u00ec<\/figcaption><\/figure>\n

N\u1ebfu b\u1ea1n mu\u1ed1n t\u1ea1o ra 1 chuy\u1ec3n \u0111\u1ed9ng ph\u1ee9c t\u1ea1p m\u00e0 kh\u00f4ng mu\u1ed1n d\u00f9ng tay \u0111\u1ec3 k\u00e9o th\u1ea3 t\u1ea1o\u00a0, nh\u01b0ng mu\u1ed1n tr\u00e1nh t\u1ea1o ra h\u00e0ng tr\u0103m keyframe b\u1eb1ng tay, h\u00e3y th\u1eed s\u1eed d\u1ee5ng c\u00e1c Expression(bi\u1ec3u th\u1ee9c). Expression\u00a0l\u00e0 m\u1ed9t bi\u1ec3u th\u1ee9c c\u00f3 th\u1ec3\u00a0g\u00e1n gi\u00e1 tr\u1ecb<\/strong> \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n ra v\u00e0o\u00a0thu\u1ed9c t\u00ednh \u0111\u1ed1i t\u01b0\u1ee3ng<\/strong> t\u1ea1i 1 keyframe.<\/p>\n

Expression s\u1ebd gi\u00fap b\u1ea1n li\u00ean k\u1ebft thu\u1ed9c t\u00ednh gi\u1eefa c\u00e1c layer. N\u1ec1n t\u1ea3ng c\u1ee7a Expression l\u00e0 javascript, n\u00ean n\u1ebfu\u00a0bi\u1ebft java th\u00ec xem qua l\u00e0 b\u1ea1n s\u1ebd hi\u1ec3u ngay th\u00f4i. N\u1ebfu kh\u00f4ng bi\u1ebft java th\u00ec c\u0169ng ch\u1ea3 sao, b\u1ea1n c\u1ee9 xem c\u00e1c v\u00ed d\u1ee5, copi v\u00e0\u00a0ch\u1ec9nh s\u1eeda l\u1ea1i cho ph\u00f9 h\u1ee3p v\u1edbi nhu c\u1ea7u l\u00e0 \u0111\u01b0\u1ee3c.<\/p>\n

* L\u01b0u \u00fd: c\u00f3 nhi\u1ec1u v\u00ed d\u1ee5 Expression k\u00e8m theo trong AE\u00a0c\u1ee7a b\u1ea1n:
\n– Expression Sampler template project (File Browse Template Pr\u1ecdject)
\n– Animation presets in the Behaviors category (Animation\u00a0> Browse Presets).<\/p>\n

Khi \u00e1p d\u1ee5ng m\u1ed9t Animation presets \u0111\u1ed3ng ngh\u0129a v\u1edbi vi\u1ec7c AE t\u1ef1 \u0111\u1ed9ng ch\u00e8n\u00a01 ho\u1eb7c 1 b\u1ed9 c\u00e1c EXP c\u00f3 s\u1eb5n. Vi\u1ec7c \u00e1p d\u1ee5ng c\u00e1c Animation presets c\u00f3 s\u1eb5n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 Behavior.<\/p>\n

II. T\u1ea1o, s\u1eeda,\u00a0x\u00f3a – t\u1eaft\u00a0Expression<\/h2>\n
\"1\"<\/a>
A. b\u1eb7t t\u1eaft Exp \u00a0\u00a0 \u00a0\u00a0B.\u00a0\u0111\u1ed3 th\u1ecb Exp \u00a0\u00a0 \u00a0\u00a0C.\u00a0Pick whip \u00a0\u00a0 \u00a0\u00a0D. Exp Menu \u00a0\u00a0 \u00a0\u00a0E. h\u1ed9p tho\u1ea1i l\u1ec7nh Exp<\/figcaption><\/figure>\n

Thu\u1ed9c t\u00ednh \u0111ang c\u00f3 Exp s\u1ebd c\u00f3 m\u00e0u \u0111\u1ecf (trong h\u00ecnh m\u1eabu : thu\u1ed9c t\u00ednh Position)<\/p>\n

C\u00e1ch t\u1ed1t nh\u1ea5t \u0111\u1ec3 b\u1eaft \u0111\u1ea7u l\u00e0 t\u1ea1o ra m\u1ed9t EXP b\u1eb1ng c\u00e2y Pickwhip v\u00e0 d\u00f9ng c\u00e1c bi\u1ec3u th\u1ee9c to\u00e1n h\u1ecdc \u1edf b\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y:<\/p>\n\n

Thao t\u00e1c t\u1ea1o, v\u00f4 hi\u1ec7u h\u00f3a v\u00e0 x\u00f3a exp<\/h3>\n