diff options
| author | David Thompson <dthompson2@worcester.edu> | 2019-10-29 17:17:19 -0400 |
|---|---|---|
| committer | David Thompson <dthompson2@worcester.edu> | 2019-10-29 17:17:19 -0400 |
| commit | ec15aa537055159fc94f667a9219dde27deefb89 (patch) | |
| tree | b811b59b9ca819a5c8addc78ae3f67e178d5eab3 | |
| parent | 2db2137911639b9a772a9de7cdcdf611d5ab747f (diff) | |
render: model: Invert texture V coords when parsing OBJ files.
| -rw-r--r-- | chickadee/render/model.scm | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/chickadee/render/model.scm b/chickadee/render/model.scm index 332d211..9f29240 100644 --- a/chickadee/render/model.scm +++ b/chickadee/render/model.scm @@ -377,10 +377,15 @@ ((u) (vec2 (string->number u) 0.0)) ((u v) - (vec2 (string->number u) (string->number v))) + ;; OBJ texture coordinates use the + ;; top-left of the image as the origin, + ;; but OpenGL uses the bottom-left, so + ;; all V values must be inverted. + (vec2 (string->number u) + (- 1.0 (string->number v)))) ((u v w) (vec2 (string->number u) - (string->number v))) + (- 1.0 (string->number v)))) (_ (parse-error "wrong number of texcoord arguments" args))))) (define (parse-normal args) |