CODEWITHSUNDEEP
openglhaskellmatrixlinear-algebra
functorial
functorial

Reputation: 687

OpenGL rotation too sensitive

I recently switched from using the deprecated gl_*Matrix to handling matrices on my own. Everything seems to be working fine, except that rotation is about 80 times what it should be. I can switch to using opengl's matrices without changing any other code, and rotation is fine. The complete source is on Github. The most relevant function is here:

calculateMatricesFromPlayer :: GameObject a -> WorldMatrices
calculateMatricesFromPlayer p@(Player{}) =
    let Vec3 px py pz = playerPosition p
        Vec3 rx ry _ = playerRotation p

        -- Create projection matrix
        projMat = gperspectiveMatrix 45 (800/600) 0.1 100

        -- Create view matrix
        rotatedMatX = grotationMatrix rx [-1, 0, 0]
        rotatedMatXY = rotatedMatX * grotationMatrix ry [0, -1, 0]
        translatedMat = gtranslationMatrix [-px, -py, -pz]
        viewMat = rotatedMatXY * translatedMat

        -- Model matrix is identity by default
        modelMat = gidentityMatrix
    in WorldMatrices modelMat viewMat projMat

Is there anything obvious that I am doing wrong?

Upvotes: 2

Views: 162

Answers (1)

not my job
not my job

Reputation: 672

Since there are 360 degrees and 2*pi radians in a circle, with pi being approximately 3, it seems very likely that being out by a factor of approximately 80 is you using degrees as input to sin, cos or tan functions which are taking input as radians, since 360/(2*pi) is approximately 80.

Upvotes: 8

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