Help please. How to get transformation for the face
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Hi everyone
I need help to get the transformation of the current face under the cursor.
I'm using the input point method but my problem emerges when the cursor is Inferenced.It is weird because my @ip.face is correct but @ip.transformation doesnt match.
I dont use a pick helper because I need to get faces outside p.e. when editing inside a component.
The only plugin that I've seen it managing well is AngleInpector from Freddo tools.
Any ideas?
Thanks
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@ip.transformation would be the transformation of the parent of the face not the face itself.
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thanks, but... what I mean is how to get the correct transformation for the face bellow when the cursor is inferenced. Is there something I'm missing?
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A face doesn't have a "transformation" per se.
The "input point" your identify can give the transformation of where it was picked - which you can then use to modify entities' transformations later...
You can "transform" a group/instance, face, edge or vertex...You can gather various info about any picked vertex/edge/face [e.g. position/line/center/normal ] - and devise transformations to modify these [bearing in mind the parent's transformation you have also collected...]
BUT what do you want to do ?Please explain what you want to 'find' and what you want to do with it...
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Thanks TIG
My intention is to highlight the face that the cursor is passing over.
In the Animation GIF you can see that when the interfering is happening the highlighted face is been drawn where it should'n, meaning that the transformation given by @ip.transformation is not the same as it was before the iterferencing while the @ip.face is still the same. (is that make sense)
I'm doing my best trying to explain this in english. -
@cesaro36 said:
Thanks TIG
My intention is to highlight the face that the cursor is passing over.You can do this easily by pushing the face's reference into the model selection set.
old_set = model.selection.to_a model.selection.clear model.selection.add(@ip.face) -
Thanks Anton
I'll try it as soon as I get to my laptop. -
Anton_S,
Do you have similar code to highlight local bounding boxes (including those inside groups and components)? -
cesaro36,
Like TIG and others mentioned a face doesn't have a transformation, but its point positions are bound to the transformation of a group/component instance containing the face. In that case, you will need to transform all points of the face into global space before highlighting the face.
Here is a sample face highligher tool:
class FaceHighlighterTool def initialize @ip = Sketchup;;InputPoint.new @triplets = [] @edge_points = [] @hovered_face = nil @hovered_face_tra = nil @face_color = Sketchup;;Color.new(0,40,255,80) @edge_color = Sketchup;;Color.new(0,0,255,255) @edge_width = 3 end def deactivate(view) @hovered_face = nil view.invalidate end def onMouseMove(flags, x, y, view) @ip.pick(view, x, y) face = @ip.face if face.nil? if @hovered_face @hovered_face = nil view.invalidate end return end if face != @hovered_face @hovered_face = face @hovered_face_tra = @ip.transformation # In order to draw a face with holes, we must draw its mesh mesh = face.mesh polygons_size = mesh.count_polygons @triplets = Array.new(polygons_size) for i in 0...polygons_size # Obtain one of the triangles making up the face triplet = mesh.polygon_points_at(i+1) # Transform to global space triplet.each { |pt| pt.transform!(@hovered_face_tra) } # Store for drawing @triplets[i] = triplet end # Get all edges for drawing a border @edge_points.clear face.edges.each { |edge| @edge_points << edge.start.position @edge_points << edge.end.position } # Transform all edge points to global space @edge_points.each { |point| point.transform!(@hovered_face_tra) } # Trigger the drawing view.invalidate end end def draw(view) return unless @hovered_face view.drawing_color = @face_color @triplets.each { |triplet| view.draw(GL_POLYGON, triplet) } view.drawing_color = @edge_color view.line_width = @edge_width view.line_stipple = '' view.draw(GL_LINES, @edge_points) end end # class FaceHighlighterTool Sketchup.active_model.select_tool(FaceHighlighterTool.new)If you paste it all into Ruby Console you will see the effect.
Anton
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There it is, TBoy:
class BoundsHighlighterTool def initialize @ip = Sketchup;;InputPoint.new @hovered_inst = nil @global_parent_tra = nil @global_bb = nil @labb_global_faces = [] # Faces for the local axes aligned bounding box. @gabb_global_faces = [] # Faces for the global axes aligned bounding box. @labb_global_edges = [] @gabb_global_edges = [] @labb_face_color = Sketchup;;Color.new(255,40,0,80) @gabb_face_color = Sketchup;;Color.new(0,40,255,80) @labb_edge_color = Sketchup;;Color.new(255,0,0,255) @gabb_edge_color = Sketchup;;Color.new(0,0,255,255) @edge_width = 3 end def deactivate(view) reset(view) end def onMouseMove(flags, x, y, view) @ip.pick(view, x, y) ip_path = @ip.instance_path if ip_path.empty? reset(view) return end inst = nil gptra = nil ip_path.each { |ent| break if !ent.is_a?(Sketchup;;Group) && !ent.is_a?(Sketchup;;ComponentInstance) if gptra gptra = gptra * inst.transformation elsif inst gptra = inst.transformation end inst = ent } unless inst reset(view) return end return if inst == @hovered_inst @hovered_inst = inst @global_parent_tra = gptra local_bb = @hovered_inst.bounds # Obtain corners of local axes aligned bounding box in global space lagc = [] for i in 0..7 lagc << local_bb.corner(i) end if @global_parent_tra lagc.each { |point| point.transform!(@global_parent_tra) } end @labb_global_faces = [ [lagc[0], lagc[2], lagc[3], lagc[1]], [lagc[4], lagc[6], lagc[7], lagc[5]], [lagc[1], lagc[0], lagc[4], lagc[5]], [lagc[2], lagc[3], lagc[7], lagc[6]], [lagc[0], lagc[2], lagc[6], lagc[4]], [lagc[3], lagc[1], lagc[5], lagc[7]] ] @labb_global_edges = [ lagc[0], lagc[2], lagc[2], lagc[6], lagc[6], lagc[4], lagc[4], lagc[0], lagc[3], lagc[1], lagc[1], lagc[5], lagc[5], lagc[7], lagc[7], lagc[3], lagc[0], lagc[1], lagc[2], lagc[3], lagc[4], lagc[5], lagc[6], lagc[7] ] # Create global axes aligned bounding box @global_bb = Geom;;BoundingBox.new() @global_bb.add(lagc) # Obtain corners of global axes aligned bounding box in global space gagc = [] for i in 0..7 gagc << @global_bb.corner(i) end @gabb_global_faces = [ [gagc[0], gagc[2], gagc[3], gagc[1]], [gagc[4], gagc[6], gagc[7], gagc[5]], [gagc[1], gagc[0], gagc[4], gagc[5]], [gagc[2], gagc[3], gagc[7], gagc[6]], [gagc[0], gagc[2], gagc[6], gagc[4]], [gagc[3], gagc[1], gagc[5], gagc[7]] ] @gabb_global_edges = [ gagc[0], gagc[2], gagc[2], gagc[6], gagc[6], gagc[4], gagc[4], gagc[0], gagc[3], gagc[1], gagc[1], gagc[5], gagc[5], gagc[7], gagc[7], gagc[3], gagc[0], gagc[1], gagc[2], gagc[3], gagc[4], gagc[5], gagc[6], gagc[7] ] view.invalidate end def draw(view) return unless @hovered_inst # Draw local axes aligned global bounding box view.drawing_color = @labb_face_color @labb_global_faces.each { |face| view.draw(GL_POLYGON, face) } view.drawing_color = @labb_edge_color view.line_width = @edge_width view.line_stipple = '' view.draw(GL_LINES, @labb_global_edges) # Draw global axes aligned global bounding box view.drawing_color = @gabb_face_color @gabb_global_faces.each { |face| view.draw(GL_POLYGON, face) } view.drawing_color = @gabb_edge_color view.line_width = @edge_width view.line_stipple = '' view.draw(GL_LINES, @gabb_global_edges) end def reset(view) return false unless @hovered_inst @hovered_inst = nil @global_parent_tra = nil @global_bb = nil @labb_global_faces.clear @gabb_global_faces.clear @labb_global_edges.clear @gabb_global_edges.clear view.invalidate return true end end # class BoundsHighlighterTool Sketchup.active_model.select_tool(BoundsHighlighterTool.new)This time we iterate through the InputPoint's instance_path and transform the bounding box of the deepest instance across all the the parent groups/component instances in the path.
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