Sam-chhu-goan (三次元; 3D ) s? t? ji?t-siong seng-oa?h tiong, ?-?ng i?ng tn?g , khoah kap koan 3 e chhu-goan lai ko?-seng e khong-kan . It-poaⁿ so? kong e sam-chhu-goan s? teh kong Euclid khong-kan . T? chin ku-tn?g e chi?t to?ⁿ le?k-su si-ki, sam-chhu-goan p? tong-cho s? lan seng-chun e khong-kan e so?-ha?k bo?-heng. Khah-cha e bu?t-li-ha?k ha?k-chia long j?n-ui khong-kan s? peⁿ-thaⁿ e. Ui 20 se-ki i-lai, hui-Euclid ki-ho e hoat-hi?n ti-su si?t-che khong-kan e seng-chit ? ki-thaⁿ e kho-leng-seng.

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