Bugfix #6918

- Multilayer EXR files:
  Rendering without "do composite" skipped to render the vector pass

- Also found a wrong loop, missing to clear speed vectors in the first 
  pixel of a tile, causing error print:
  "Found uninitialized speed in vector buffer... fixed"

2 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/render/intern/source/pipeline.c b/source/blender/render/intern/source/pipeline.c
index 02396091a17..db077c8a1b1 100644
--- a/source/blender/render/intern/source/pipeline.c
+++ b/source/blender/render/intern/source/pipeline.c
@@ -576,7 +576,7 @@ static RenderResult *new_render_result(Render *re, rcti *partrct, int crop, int
 
 static int render_scene_needs_vector(Render *re)
 {
-	if(re->r.scemode & R_DOCOMP) {
+	if((re->r.scemode & R_DOCOMP) || re->r.imtype==R_MULTILAYER) {
 		SceneRenderLayer *srl;
 	
 		for(srl= re->scene->r.layers.first; srl; srl= srl->next)
diff --git a/source/blender/render/intern/source/rendercore.c b/source/blender/render/intern/source/rendercore.c
index 4e32cd16acf..b12d6094f2b 100644
--- a/source/blender/render/intern/source/rendercore.c
+++ b/source/blender/render/intern/source/rendercore.c
@@ -772,7 +772,7 @@ static void reset_sky_speed(RenderPart *pa, RenderLayer *rl)
 	fp= RE_RenderLayerGetPass(rl, SCE_PASS_VECTOR);
 	if(fp==NULL) return;
 	
-	for(a= 4*pa->rectx*pa->recty; a>0; a--)
+	for(a= 4*pa->rectx*pa->recty - 1; a>=0; a--)
 		if(fp[a] == PASS_VECTOR_MAX) fp[a]= 0.0f;
 }